Despite what it may claim, the purpose of ConverterSearchHD is not to provide users with some useful features or convenient links to popular websites and services. No, its goal is to sneak its way onto the user's device, most likely though misleading distribution practices such as 'bundling' - where the installation of the application is hidden somewhere in the installation process of another more popular freeware program, and to start generating revenue for its creators by driving artificial traffic towards a fake search engine.
In ConverterSearchHD's case, it takes over the homepage, new page tab, and the default search engine of the browser and sets them to open feed.convertersearchhd.com. While the application is present on the device, users will not be able to restore the settings to their previous state. The search engine promoted by ConverterSearchHD is considered to be fake because it lacks the characteristic function of such engines - it cannot produce a list of relevant results for the user's search queries. Instead, it redirects every query through a legitimate search engine - search.yahoo.com.
While Possibly Unwanted Programs (PUPs) like ConverterSearchHD are annoying certainly, they are not nearly as threatening as other malware kinds. Still, users are advised to remove these applications as soon as possible due to the security risks they represent.