Hi @Opificio della Fotografia,
Thanks for sharing the details and the report. I checked the document you attached, and I see the InDesign version mentioned there as 21.0.1. Could you please confirm if that's correct? If so, I'd recommend updating InDesign to the latest 21.1 version and then testing the PDF export again.
Also, please let me know if this crash happens only with this specific file or if you're seeing the same behavior when exporting other InDesign files as well. Another important detail is whether you see the Adobe Crash Reporter when InDesign closes. If the crash reporter appears, please submit the report and share the email address you used via DM, so I can check the logs. I checked using your community email and couldn’t find any submitted crash reports so far. You can refer to this page for submitting crash reports: https://adobe.ly/3Z7oDyA.
In the meantime, please also try the suggestions shared in this similar community discussion and let me know if any of them help: https://adobe.ly/49KwrMX. I'd also recommend going through the steps in this Adobe help article related to PDF export hangs and testing again: https://adobe.ly/3Yv9ozm.
If the issue still persists after trying the above, could you please share the affected file with me for testing? If the file is confidential, feel free to share it via DM using a public cloud service like Google Drive or Dropbox. If packaging works, please share the packaged file as well, following the steps here: https://adobe.ly/3NAtm9x.
I'll look into it further once I have your update.
Abhishek