Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e7286fef0efeb9…

MALICIOUS

PDF

59.5 KB Created: 2021-07-30 00:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cb2fe68b94f41f351345c7f206d049ed SHA-1: 791b6a0b407dc1b7b383b7fcdee9055f91fd0b62 SHA-256: 28e7286fef0efeb975ddcc1dffe07b0593964da0cd4e9f68de0056aabefb6330
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links pointing to potentially compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The presence of these links suggests the PDF's primary purpose is to direct users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9740

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d95351fdb---xaludiz.pdf In PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210726125405.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/42778040192.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7480e91abde4b03636631d66149ef4ff/diduwaduzuluxuxasuwar.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/zolunajagejuzovin.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/pazufuliwekovemaketa.pdfIn PDF document text
    • https://auto826.com/uploads/files/jipazodeziwuzewi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/porumo.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/9265605046.pdfIn PDF document text
    • https://triosms.com/userfiles/file/84466887852.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/69459682377.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/lujokokinigoved.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e83b12527---38789535246.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/23958630928.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160715e92dd283---68244272202.pdfIn PDF document text
    • http://partnercable.hu/files/savuzejimew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4276a6593---90632835673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+toggle+sprint+1.8.9PDF link annotation

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