Malicious PDF — malware analysis report

Static analysis result for SHA-256 213c595ba750b527…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 21:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07ef5226e34714a388eb6c79f2779a58 SHA-1: fa1ac789e63e0b00a7878e6e3de36bfbac2aa262 SHA-256: 213c595ba750b527fba3d87f114e31a4acc7e8fb6f9a9845903945ce8d2951ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74d6a2425f---fifodoxuwagibijebale.pdf In PDF document text
    • http://cokhiminhhien.com/media/ftp/file/72108712150.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/zibomozano.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379247194b---babijofebigaputisoputa.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/biladevelibulojiwinubosok.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b41hndbgouvf7gjrteptegdsh5/rubugab.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/1tjj7t2ttocsndt0lnfi8vcsoa/risalasevu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608be1c2bef14---39432644744.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/79655468529.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c3014152b30b919eb05c33a96dc36ce4/21827435489.pdfIn PDF document text
    • http://offerparts.com/upload/files/28818228021.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d06701aa0b---verexomizagejenesob.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/74148699611.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/85973792305.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/17515903870.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///31359203726.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/27012976089.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/rososuremutovemixanajolob.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/79661710673.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cjrcd6iuv6frn9enq55u4lupjl/5780796687.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/nikewol.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/60876451584.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/11646590275.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/42429422291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wireless+communications+principles+and+practice+2nd+edition+solution+manual+pdfPDF 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_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 17908 bytes
SHA-256: c184f0ab6049be09cef5e2df75ef758a2982897db7b59e245de6e79745599fc0
font_02_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 10992 bytes
SHA-256: d6443914615694310386ea1f5378f95ee448aa788c23895105838fa044d801f4

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