Why script blocker blocks this site?

[polonus]

Saw that code in links on various sites. Blocked for me by uMatrix.
Nothing detected here: http://killmalware.com/w.usabilla.com/ & http://toolbar.netcraft.com/site_report/?url=usabilla.com
Stealth name servers detected: http://toolbar.netcraft.com/site_report/?url=usabilla.com
See why: https://www.virustotal.com/nl/domain/w.usabilla.com/information/
and also Avast detects: https://www.virustotal.com/nl/file/e78736c0ae2529a8e39abf6ae1a6e8e041024fe801ed7facfe0a780413efd5fd/analysis/
WOT has good web rep, is this an adtracking PHISH.

polonus