With a few links you have little to worry about looking like a link farm.  
Try to link only sites that are similar on a page. A link farm is all types of website links.

Scam Verification. Wanna know if a dubious looking website actually pays its users? Forums are the best place to check.
 
Referral & Affiliate Booster. Forums are a perfect channel to promote your affiliate or referral link. Heavily trafficked forums with thousands of readers are an excellent way to get successful referral conversions. Just remember not to spam or you’ll easily get banned.
 
Free Signature Backlinks. Signature links from reputable forums will help new websites to be indexed by search engines. You can also sell your signature links for money or use it to promote your website or affiliate programs.
 
Money Making Knowledge. Knowing is half the battle won. Forums are great ways to discover new ways or methods of making money online.
 
Troubleshooting & Appraisals. Maybe you don’t understand why your Adsense CTR is so dreadful, or why your blog has terrible search engine rankings
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