thiago,
i have now enabled a few more "Metadata source" plugins. Here are the active plugins:
Amazon.com
Big Book Search
Edelweiss
Google
Google Images
Open Library
Overdrive
Even with all those enabled plugins, "Download Metadata" still gave the wrong metadata and cover for one particular PDF. But when I run the Extract ISBN plugin on the same PDF, it was able to get the right ISBN.
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