@Ghitulescu - putting an image of the first page at the start of a PDF is a widely used practice for PDFs that don't have a cover. That said, PDF's do not have a cover as such, if the first thing in a PDF is an image then that is the implied cover.
If you don't want the 'first page image' on the EPUB then replace it, perhaps with a generated cover, before you create the EPUB. If you don't want the EPUB to have a cover use the Editor or the Modify PI to remove it.
IIRC if you do a Save to Disk or Send to Device calibre will create an EPUB with the cover.jpg thats in the library. I don't use those features for that reason (and others). I like to have a cover in the library (most are created via Generate Cover PI), but I don't like/need them on my devices.
BR
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