One of those two sites is distributing adware. Which of them?
File Converter (FOSS) by Adrien Allard was hosted on file-converter[.]org since a decade. Then someone a few weeks ago snatched that domain and it’s now distributing adware. Almost identical design for the page, 100% designed to deceive users to download a different product, as it’s called Zamzar.
Would fdroid be safe from this kind of practice? Of course there’s no web domains involved but the exploit there is potentially the same
Yes, Android apps are signed and Android refuses updates with a different signature.