Nothing on http://www.urlvoid.com/scan/wonderland.bz/, it is possible it could be getting pinged on the IP address of a previous domain “THE DOMAIN IS NEW SO BE CAREFUL!” (from the URLVoid report) or it is is something to do with the domain host.
There is an on-line contact form, http://www.avast.com/contact-form.php?loadStyles for: * Sales inquiries; Technical issues; Website issues; Report false virus alert in file; Report false virus alert on website; Undetected Malware; Press (Media), issues.
If you are reporting an FP, then you get another input field open, enter the web URL for the site you wish to submit for review (Network Shield), etc. A link to this topic also wouldn’t hurt.