Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db47b24236cbf74…

MALICIOUS

PDF

76.8 KB Created: 2021-06-15 22:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec917db6f425ae9180e28e008f0dcc21 SHA-1: ccedc75dda7f278694968dbab7d8e0db7b46813d SHA-256: 8db47b24236cbf74fe1e9a5f1e73c84e0b82f6c76b6da646dc50c32130034a83
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=edit+pdf+online+pdf+pro
    • http://beautybybelief.com/admin/images/file/6547388343.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9fc0707c---vetotasupimokibepunuj.pdf
    • https://securitydm.rs/slicice/file/jibika.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5937471a---jojujovuxanatizosonip.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/90rqmnjcrgd2lr3ef7e62dckrk/85647070014.pdf
    • http://gramercygrand.ru/files/file/43738995930.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/kpqcn1qp5gohvvnm76eopkd8g2/46543589473.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c09c8acca51---25360284169.pdf
    • https://transport-vehicules.fr/userfiles/file/xuzuruvuw.pdf
    • http://www.anjhimayath.com/upload/file/furogaxiwopetuwek.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ldn69tfb5f0a0hp8gg292dijrc/mukerevemaxenep.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b6a5775203242a1a32227e743fa0e2ca/48611296240.pdf
    • http://stacjaregeneracja.pl/userfiles/file/32203879648.pdf
    • http://paliukenas.lt/i/File/migenaputuxaruwusotofoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f109.bin
93123d8cd81563044daae49b830a1a17970ff25ead231c19e805f024e81493fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 4604 bytes
font_01_sfnt_off000100c4.bin
6b0731b0dc3dc9d32f715afe2abd51374e0d0912aaf5082bb88fa3b1ba0541d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 11192 bytes

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