Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc4b635d3a3f11d…

MALICIOUS

PDF

80.8 KB Created: 2021-05-15 15:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bad55a92fd9fd0a3237fe8f2f5813281 SHA-1: 517a7606a617d7d6a2f49adaf59fe6aea70ed90d SHA-256: 8bc4b635d3a3f11d1e0f02b165ccb91d162745c85f6700fd000513520a2415aa
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 or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ec243bd2---zivorimijavibov.pdf In PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/567ca2a9a2f8ff9f72314892b2dfeddd/95772241943.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075f26de092a---vumilegajovunafilugu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5bg5qheodt1phksmjiblk4b8nv/bojetulivadoroxegev.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa6e10cd5aeedf3488bf8c45152a4bd4/dotomuzasuzukoguzewo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pebunubunukajuwiroto.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c911210a1d7fd8bcb1553bc24b7b7480/monidimovoxul.pdfIn PDF document text
    • https://x-software.cz/data/file/93875885695.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3a427c5b---zorezonazovewubam.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/bfbbed37de1d2fce9147464170ceee6c/xaxufitaxamofulenonazew.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a67888f5---17696745993.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/74218bd764a71923c1203534b54e98f8/94468774012.pdfIn PDF document text
    • https://loctra.net/userfiles/file/wotidelukutopakejum.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45e9ba4d0---muruf.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/s7ijumak2hu29rh92ealhfc14b/62721893028.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aad89b72d---19570023994.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f5f2aee1---50756356645.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=arya+malayalam+movie+bgmPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 5120 bytes
SHA-256: a0b4e031481c1a48b9e6a1cf7b8713298ac9b7a86f149eca96562906363c1845
font_01_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 12940 bytes
SHA-256: ac7fd62b9e85286e56b40dece6d5a490fc389642b7e10c1028597c0a19db6487

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