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Piwik is an open source web analytics software that is used by many web masters. And the bad guys are using their popularity to try to make their malware injection harder to detect. They do that by injecting malicious javascript calls from a domain that looks like came from the Piwik project: www.piwik-stat.com/piwik.js. This is what is being injected:

It is not an uncommon tactic (we see if often with jquery), but as a web master if you see anything from pwiki-stat or similar variations, it is likely fake. The official (and trusted one) is http://piwik.org/.