Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3eb3d765ae4bf7…

MALICIOUS

PDF

81.8 KB Created: 2021-08-23 14:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a4a5704769f2346b09d837e121dc498 SHA-1: 2692eb26c41b0d835f03b9612ed8419614495d47 SHA-256: 8a3eb3d765ae4bf7025bfff49958766f0c79c354a60eebb3adfffbb2faf872b6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS uploads. No scripts were extracted from this sample, but the sheer volume of suspicious URLs suggests a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

Heuristics 4

  • 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 https://philabc.ru/uplcv?utm_term=coenzyme+q10+deficiency PDF link annotation
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/burusu.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/86512441125.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/konejivimafukanetadedi.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/vutugaguxitetevu.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/dijitewexanog.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/gikewibuvumura.pdfIn PDF document text
    • https://semut73.com/contents//files/66851021698.pdfIn PDF document text
    • http://vodnik48.ru/content/file/gatutoruz.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/189e0fc1c372a5c232d29a621e462ccf/lugetanofupajovul.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7413d69fd---28895964334.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/telasefuwururifoze.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/49349440173.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/jupexebuf.pdfIn PDF document text
    • https://la-klamm.org/Files/files/jepimotizenodevav.pdfIn PDF document text
    • http://chapelguild.com/images/usr/27736678551.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/97388211896.pdfIn PDF document text
    • https://businesslife.com/content/file/86149436626.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/60522934355.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/71206544089.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/rovuvazubidejalunotonuda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df4947c1fd---391146943.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/gubuwazunolu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39fc7b1ec9---84189394263.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/neroxikududozekaza.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/kupezixadufuketo.pdfIn PDF document text

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