If you do a google you will find hundreds (thousands?) of these URLs recorded. It isn't new, I see them from 2012.
It appears to be a wordpress posting SEO bot called XRumer
It is incorrectly leaving its diagnostics. It is leaving these URLs everywhere because it is fetching them, and fetching them can mean some sites record them, especially if the URLs are not 404 they leak into the wild and then into google.
For example:
http://liuhaob5.wordpress.com/2011/09/26/how-to-use-the-nds-r4-r4r4ir4i-ds/
[ Activation ] Result: used self-learning system data; chosen nickname "liupingkaka"; profile edited; logged in; success (profile was registered successfully, but there is no permissions for creating new topic); BB-code not working;
Result: used self-learning system data; captcha decoded (3 attempts); success %u2013 posted to "mero tax";
Result: used self-learning system data; captcha recognized; registered (100%); profile edited; logged in; success %u2013 posted to "Talk Shit";
Result: used self-learning system data; captcha recognized; registered (100%); profile edited; logged in; success %u2013 posted to first encountered partition "Rules"; (reply to topic);
Result: used self-learning system data; captcha recognized; registered (100%); profile edited; logged in; success %u2013 posted to "Your first forum";
Result: used self-learning system data; registered (100%); logged in; success %u2013 posted to "General Gaming Discussion";
»
en.wikipedia.org/wiki/XRumer