You can always load your ePUB in Sigil. There is a simple metadata editor there and it is also possible to set the cover right. If no cover is specified, a lot of readers will take the first page as cover.
Pdurrant is right, there is no good tool to convert from pdf to ePUB. There are a lot of mediocre tools for the conversion. Depending on the PDF, expect a lot of post work to clean everything up.
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