Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1ebe7902329414…

MALICIOUS

PDF

261.1 KB Created: 2021-09-05 17:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9309d36179f4cea83584d79ee3c756f6 SHA-1: 12d184971895cafc83478ccbbf34eb66de7db7b4 SHA-256: 4c1ebe7902329414db10c2d4a5b18d9c597d1dc7cc851482d3a657f9e4d65580
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads. The PDF likely exploits a vulnerability to redirect the user to one of the numerous linked URLs, which are designed to host and deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9481

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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://kaztelcom.kz/ckfinder/userfiles/files/zuvoromi.pdf In PDF document text
    • https://nomaquito-travel.com/editor-images/9834440803.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/pofawepogagobamazunububep.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/82484418314.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f40209d6b---sodejubesuvoxegawa.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/zizuwokiwajuda.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/64911321785.pdfIn PDF document text
    • https://blokhol.com/upload/files/gowav.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vuh313db9kv6asl1hq7bo27rd6/95573719121.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac3a7mft5mh51ntj76tk88rul7/mupel.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/17616884941.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7e9c8fa6b371c72a72abaf340b387ee8/pisapimulixubuga.pdfIn PDF document text
    • http://ministerium.pt/files/85202097319.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a387d647daa---fumopusazakowa.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/699bf05d7ce2797b625b165b04f0453f/32371361016.pdfIn PDF document text
    • http://youil.org/userData/board/file/kaduxudojalugudagerunu.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/q1m8egeafm9j8f20t1futj08bl/26206297510.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adffec6e4d1---7676348574.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/86760479523.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b071b102121---4192558548.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210701065737.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935b808e88d---20045395673.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/22875391777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=codigo+penal+argentino+2019+pdf+infolegPDF link annotation

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