Constant svchost.exe URL:Mal popups

I keep on getting this message popping up on the bottom right of my screen.

“Avast Web Shield has blocked a harmful webpage or file.”

URL: http://simplesitescan.net/4242/TerminusTurbo_142669035163620.dll
Infection: URL:Mal
Process: C:\Windows\System32\svchost.exe

I’ve had several variations of popups like these, with different URLs. I’ve run a full system scan with Avast and Avast has not found anything. I’m not sure how to fix this problem. I’ve read up on other threads but I’ve noticed most replies are specific to the user.
I would really appreciate any help regarding this issue.
Thanks in advance.

Hello,

https://sites.google.com/site/cannedfixes/farbar-recovery-scan-tool/FRST.gif
Scan with Farbar Recovery Scan Tool

Please download Farbar Recovery Scan Tool and save it to your desktop.

Note: You need to run the version compatibale with your system. If you are not sure which version applies to your system download both of them and try to run them.
Only one of them will run on your system, that will be the right version.

[*]Double-click to run it. When the tool opens click Yes to disclaimer.
[*]Press Scan button.
[*]It will make a log (FRST.txt) in the same directory the tool is run. Please attach it to your reply.
[*]The first time the tool is run, it makes also another log (Addition.txt). Please attach it to your reply.

I have attached the files with this reply.

https://sites.google.com/site/cannedfixes/home/hosted-images-tools/51a612a8b27e2-Zoek.png
Scan with ZOEK

Please download ZOEK by Smeenk and save it to your desktop (preferred version is the *.exe one)
Temporary disable your AntiVirus and AntiSpyware protection - instructions here.

[*]Right-click on
https://sites.google.com/site/cannedfixes/home/hosted-images-tools/51a612a8b27e2-Zoek.png
icon and select
https://sites.google.com/site/cannedfixes/home/hosted-images-tools/RunAsAdmin.jpg
Run as Administrator to start the tool.
[]Wait patiently until the main console will appear, it may take a minute or two.
[
]In the main box please paste in the following script:

createsrpoint;
autoclean;
emptyalltemp;
bitsadmin /reset /allusers;b
ipconfig /flushdns;b

[*]Make sure that Scan All Users option is checked.
[*]Push Run Script and wait patiently. The scan may take a couple of minutes.
[*]When the scan completes, a zoek-results logfile should open in notepad.
[*]If a reboot is needed, it will be opened after it. You may also find it at your main drive (usually C:\ drive)

Post its content into your next reply.