If you own a PS5 or Xbox Series X, you can get a physical disc. This is the only legitimate "ISO" source. Insert the disc, and the console installs the game. You own it forever, you can resell it, and you don't need to worry about malware. Check eBay or GameStop for used copies under $40.
To put it bluntly: The search for a Need For Speed Unbound ISO is a wild goose chase that leads to a digital ghetto. Need For Speed Unbound Iso