Going true some traffic records of google analytics I can across something that was really odd, some url forum.topic24383812.darodar.com and what makes it even more odd is its behavior is when you follow this url source what we get a is a 301 redirect like this.
But before I can says this is for sure a this is a real spambot even tho its behaves like one: redirecting, non real domain and probably using software like XRumer to craw the site for new sites which could contain vulnerabilities and be able to attack it in order to get some information out of it, or simply trying to brute force the web application.
How to protect it from it? Well there is many ways to do it, but in my case since is a WordPress site I can use Wordfence, is one of the most populars and effective out there.
And also we can do this by adding some small cod the .htacces file:
SetEnvIfNoCase Referer darodar.com spambot=yes
Allow from all
Deny from env=spambot
With this simple tricks the experience in the web it will be bit more secure.
Great reference to learn more about spam bots –> Stack Exchange
Another great site of resources –> Kloth
About security –> Privacy