Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5daba2f49a14f59…

MALICIOUS

PDF

111.7 KB Created: 2021-05-07 15:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7547dff1b0251854057d494db69ac2e SHA-1: 6e1679ab26daf991baa4483fb19b05f98376bdf6 SHA-256: c5daba2f49a14f59198170dd2f0c92e76b03b3b5583e75f4ece90d55e9d79563
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. This suggests the document is designed to redirect users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9755

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 https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/58801714f6626977b34c0ba0c8aa671d/6088064285.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/43d7cafebfe5adaaa693c3113f407cea/vivub.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ivm6f6qp6e7mfl3dk1g6nfjmaq/98705423724.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c952bac66e---35425445110.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcbde3dbb3---nemonis.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pnvvlo7iedjqnc248gvjdnqt3n/zirilinazedarowafevixif.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092667db915c---73724277680.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c227b6561661ddbc9381c94ba4d076a8/52474689665.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/uo09d16mlhk90n94s4fe4locbr/14806299710.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gok6n8ig0em07s52hmtbsfrlv1/98925047152.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/136d8da9f7ab1f5791170894e1cb536c/26023972864.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160795800a80b2---tofimizugofijubuleb.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430190712789964.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/49d260a153f5934c3324dac22fbafea9/74654983788.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7ec63b2d7afc26b29b1c30b5ebb6c51f/nitizuzebexedipenasif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kdoqi+guidelines+ckd+2018
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019c23.bin
51ae68a995d798288aa9a661e5e2709d8dd914b74a658c021319bb2468f1970a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C23 5480 bytes

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