Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d230995157ea57…

MALICIOUS

PDF

89.2 KB Created: 2021-08-12 07:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b5faed7db631f66dde3732a8d5fb0db SHA-1: 713bb4bfd176e2bf3262cfb3aad9e3fce31d3a5f SHA-256: 37d230995157ea57d7f848d8e3c3bf74d03526a270da5b2efba5bd2653d6b2d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a ML classifier flagging it as malicious and ClamAV detection as a phishing trojan further supports this. Although no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://amexeuro.com/an3_Uploads/file/zinuvi.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbe21b99cbf33d7cd46c2a9e7021d9d8/91613548761.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060908053618.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be22db0d68c---86014688011.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/kowomijisemenunidilok.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/32915297804.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160878f2c46a5d---17732981938.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a90aefd3802---50382319718.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/7549178507.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c9d280e08---79570165642.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/niwowulusakafep.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/23608386928.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/66520745906.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/64a1e098ab627d4dee0e744049a75109/75334369694.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/88852301325.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/wufimoxubiwol.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41a9a30cc0---faparomamageki.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/97697771182.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/62864518907.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/79030239450.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf8a25f30---3984711005.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xolonamuluparimiperodaxo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db60d39a5d---29765837561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=wwe+2k+free+download+for+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 17396 bytes
SHA-256: 7de916207e0fa81632c8587d7f072012e27e0520f58dbf232e5c6741e540c9ab
font_01_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 10548 bytes
SHA-256: c6e6f8cfeb49faf16f0cef7459b48c729614c6b5e6c75d4cd4d55d24ceb0a683
font_02_sfnt_off00013c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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