Search.searchdirma.com is a Web page, which hosts a simple search engine, which may redirect users to more popular search services like Yahoo or Bing. While this behavior may not sound odd at first, it gets suspicious when you find out that Search.searchdirma.com is being promoted through the use of low-quality browser hijackers and Potentially Unwanted Programs (PUPs.) While there is nothing dangerous about such applications, they may cause trouble by modifying your Web browser settings so that you get redirected to Search.searchdirma.com or similar websites whenever you perform certain actions. For example, you may end up seeing Search.searchdirma.com whenever you try to load a new tab or initialize a new search via the address bar.
The good news is that even if you have to use Search.searchdirma.com's services, you will still not be exposed to harmful content. You may, however, end up seeing extra advertisements, and the search engine may also collect information about your search and browsing habits.
If you believe your settings have been hijacked by 3rd-party software, you should try to resolve the issue immediately. The best way to do this is to install and run a reputable security tool, which will easily identify and eliminate PUPs or browser hijackers. Once the intrusive apps are gone, you should be able to easily restore your browser settings.