Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8060229252f0d9…

MALICIOUS

PDF

76.9 KB Created: 2021-05-10 11:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c761bda329fffd687f616512308dd1a SHA-1: fcf54a185fc58abe0f287faa46dbe3797284b3af SHA-256: 8d8060229252f0d994ab54a58f2e389488493cce8ad28bbc30290bcaef66e663
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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 http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a84ef19a5---jagupujuzexonuxe.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160920365459c2---36786034805.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad80dead41---bopatipepibamiz.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f3c94cd30114fc8cff1b60b447566389/14880448335.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720e9980462---buvugofijuwab.pdf
    • http://appletechsolutions.com/userfiles/file/80876568835.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/fe80be2481cadec988ac59c88bbcd0cc/lasak.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/309d16c3490e4d89c59366af635f2f4c/vaxigepesakidexexonufu.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c8mkck12ah713bs7h1iv7ndql7/16721785251.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/bbb38lb6d8o073rcl1cf2dr6t9/ridirag.pdf
    • https://aduanaldelvalle.com/userfiles/file/puxiburidojetalojapi.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073be4c0ec52---gesuzuzesotifiwisi.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44d6ccfd1---bulobavirejizotuguripid.pdf
    • https://airflow-skateboards.com/upload/file/57215324639.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e329cadde302c73a7f2e24cbfc9f98c8/senonunuladewob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+android+games+with+ps4+controller+support
    • 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_off0000edf8.bin
3613de199dd6f2e286660d0a929b15432adc054bcd231a0e8ed2507f75a00b19
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 5716 bytes
font_01_sfnt_off0001015e.bin
e9fef1051b02b3e51e658f362f8d675baf4f83e974e3bb2cb1e473a94d2d6a1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 10688 bytes