I have a medium size site, and It's current google page rank is 4/10. In order to improve its Rank, I'm considering using a mass links submission tool like "All-in-One submission", that will submit a link to my site to few thousands site's. some of them are more legit, like DMOZ, and some of them, I guess, are link farms.
does such a submission is dangerous? can google punish me for doing that?
and if the answer is yes, do you have an advise how to submit my site?