Problem: How do I get Search to return the results witha link to the document itself instead of DispForm.aspx?
Resolution: To verify this go to Central Admin > Manage service applications > Search service (your instance) > File Types (found under the crawling section).
1.Add pdf if it isn’t there.
2.Restarted the search service from services.msc.
3.Reset the index
4.Ran a full crawl.
The search results will now linked to the document itself instead of the DispForm.aspx, without installing any iFilter.