Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ea8bb4fd96a9d6…

MALICIOUS

PDF

68.2 KB Created: 2021-05-02 16:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c62dfb18f161ccd4a2933010b059a6e SHA-1: 27da2dbb3a8bf18c818270ba3f6ff3b49e2dbad3 SHA-256: 34ea8bb4fd96a9d69573e59c4be306cd3f89473b0f914cfda8e8d955b2bfbae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ce1b4056a973e8f6e752e3d0ea3c675b/tubefilezunimesikevob.pdf
    • https://ludifrance.fr/userfiles/file/52415614675.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/916e4ff91fcc32e50e38a69788a296e1/zubazezufunatebibol.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ce5b488f1fb4950d041ebc98afe804f3/lakokebikunojevigew.pdf
    • http://asustainable.com/global/file/39652874700.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d47c08a409---41857792733.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/04dc62ab02537d692559b8645b4ff9cd/gigoma.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf076c3a8---dukepobeganamarusadi.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805b45ae495---75581739303.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/9e1ec37e51ccd3a47f9ddfc35003a3c6/82426680459.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080d840e60d5---75465567404.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/62f66a57dc94ae0261667e94f457e63a/jojivafapalezukemuxirike.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=aileron+font++ttf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7496f55361e28f3e77060c171af24c35/66646600155.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d10d.bin
b3db026551e31e50d154d8529b91292bb534ce9cca8e542b30d991c9bd4d9771		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD10D 4360 bytes
font_01_sfnt_off0000dfef.bin
ccfb3cc23743ff7cdf1350b6c8e9e2e74baa15cce0f33c336009e837c30d3fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 10264 bytes

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