Google Analytics 6.5.3 ? .. Beware, this is not from Google

I have installed the codes and is paste javascript all over my site with invisible text backlinking to cheap loan and money borrowing websites.

Beware !!

More information on user experiences here :-
https://www.dnexpert.com/2013/03/16/website-hacked-removing-the-google-analytics-malicious-wordpress-plugin/

https://quttera.blogspot.sg/2013/03/Malicious-WordPress-plugin-using-dynamic-fromCharCode-method.html