Please ‘modify’ your post change the URL from http to hXXp, to break the link and avoid accidental exposure to suspect sites, thanks.
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, etc. A link to this topic also wouldn’t hurt.