Consequences of not disclosing the last employer

I had worked in a private IT organization for less than 3 months and would like to omit this experience. I had not left the organization on a very good term (though I have the service certificate from them with conduct as good) and am concerned that they may provide negative feedback in background verification by a future employer. However, as I need to provide my UAN number to prospective employer I think my employment history can be found by that as the last organization had deducted some PF amount also from my salary. Please advice what would be right here ? To include this employer in my experience or to remove it? RIght now I am not working and looking for a job so need to tell the prospective employers accordingly. Kindly advise