I recommend to build a site that analyzes suspicious files.
There are many already… 
VirusTotal http://www.virustotal.com/
Jotti http://virusscan.jotti.org/en
VirSCAN http://virscan.org/
ThreatExpert http://www.threatexpert.com/
Anubis http://anubis.iseclab.org/
Comodo analysis http://camas.comodo.com/
Norman sandbox http://www.norman.com/security_center/security_tools/en
I recommend to build a Avast suspicious files analyzes web site?
avast online scanner http://onlinescan.avast.com/
Summary of Virus Reports http://www.avast.com/en-no/virus-monitor
These are file scanner! Analysis of the file is not these:
VirusTotal http://www.virustotal.com/
Jotti http://virusscan.jotti.org/en
VirSCAN http://virscan.org/
Threatexpert / Comodo / Norman sandbox / Anubis will give a automatic analysis report
like this http://www.threatexpert.com/report.aspx?md5=0df494d7cdea18ac9f8912cfce9ebd23
Sites to analyze suspicious files
Will analyze the submitted files:
Avira
http://analysis.avira.com/samples/
F-secure
https://analysis.f-secure.com/portal/login.html
F-prot
http://www.f-prot.com/virusinfo/submission_form.html
Eset
http://samples.nod32.com.sg/
Panda Security
http://www.xandora.net/upload/
Microsoft
https://www.microsoft.com/security/portal/Submission/Submit.aspx
Symantec
https://submit.symantec.com/retail
Emsisoft
http://www.emsisoft.com/en/support/submit/
Norman
http://www.norman.com/support/sendmalware/en
Quick Heal
http://www.quickheal.com/submit_sample.asp
Trend Micro
http://subwiz.trendmicro.com/SubWiz/Default.asp