Malicious PDF — malware analysis report

Static analysis result for SHA-256 c381bd500308b36c…

MALICIOUS

PDF

87.3 KB Created: 2021-07-23 05:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea13e38be98cdb66fb06dab3008aab2d SHA-1: 0ae4e8fd16313e322b1c5e525f5ae908cc0bc239 SHA-256: c381bd500308b36c1afe82742eeed92368cc81a1d048b239b1f26908ef46aeb9
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as a lure to redirect users to malicious content, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3829

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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1166a2ceb---51668534227.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cc8075e75---rusaxatedetukig.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/89394349470.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079334171155---jodesok.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160874594aa978---zinegidibonilodulipep.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/13396468180.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a83b2e13---tifexepi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160861e3864b4f---2388875780.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/1862716563.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/72248167505.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/46bd96fa6fc4508b80be0878958c9ae9/79940102039.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d117c8c1936cd5ab83db868e90206fda/77577528055.pdfIn PDF document text
    • http://brukbet.com/user_images/file/tununaseludon.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/1daba45ede3c9a21333979a6320ba2e3/81956030453.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607599d953d8a---fegosawijirosafuxirem.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1vcnfkf6mh2a48r5s2rm9q5fk4/gidufodetubusavuza.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/zokazozago.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc9b3b1a7---44785472368.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9a5c0fa0b4726b95c928766c28f5b1ff/35701240442.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/g576dkf9odbbaim63rd3o98kqf/xilezobe.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/kikosajosudoliki.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/61381327783.pdfIn PDF document text
    • https://mfdesign.hu/files/file/97619848212.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/84884317904.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa61e0edb9---78102077450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wow+brewmaster+monk+talentsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0aedc998a231e7ce787e8d95bf64193c/bepamemuxu.pdfIn PDF document text

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