Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b37fd07d62e77a…

MALICIOUS

PDF

86.6 KB Created: 2021-05-10 15:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3138b578eb71269c6c7074efef93cc3 SHA-1: 78859b3a977b9af5c880121c11d4f48b058b94ca SHA-256: 97b37fd07d62e77af71724558e2524b210bd573b06be6c4268bb795dabb6c960
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

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://ketchas.ru/uplcv?utm_term=trophy+guide+darksiders+2+deathinitive+edition
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e9291e7eb7e7ac93af536d8ea86a6df7/rosejafefumekapemo.pdf
    • https://alutat.com/data/file/70606307257.pdf
    • http://www.aadhar-interior.com/userfiles/file/wiruvumifopesite.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bb94e18b---panubasujuxoxabekumono.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pb9eodqh9o4310d5mi0jiflkml/tijesisukalufonowifuzi.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/edcb265b692062f5ca582a781b441c00/7051991611.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096902f446cd---vutadiniritaxenebimupu.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ljags74n9qt1n46nucm8h6gheq/68485185501.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/nqnip7i1cc82ge22nor3uaqhvl/66323874698.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c195dcbd65---bokewaluwijudigu.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e72c8042---zatap.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/499fea1b0ba843a27bff9b6e4e9813ba/87993380078.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903240da230---81113200121.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa355bccf---famofirejasulonobaso.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783e9ece89b---wisiwirovum.pdf
    • http://doktor-okonski.pl/uploadimg/file/jezotokawiri.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_off00011143.bin
be48c5f236c3c6fc50f3853713cf7b976d6702a6b2f552674fb48ecbed255e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 5496 bytes
font_01_sfnt_off000123fb.bin
9907647a485b3e57f81f0e7d0fd3022209ab326a6da50da1860901dd881dfb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 13016 bytes

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