This is called spam. xRumer is the software you want to use if you wanna spam the internet and tank your rankings.
Wikipedia "XRumer is a piece of software made for spamming online forums and comment sections. It is marketed as a program for search engine optimization and was created by BotmasterLabs. It is able to register and post to forums (forum spam) with the aim of boosting search engine rankings."
I'd suggest looking into modern (and non-spammy) techniques on link building.