Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2728a492122066b…

MALICIOUS

PDF

73.6 KB Created: 2021-06-22 22:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4083fae62afb077bd0b24cd6e376d9e6 SHA-1: 8a0a7b10031be6b5b4491ec716f46b8e0c1d0e68 SHA-256: b2728a492122066b39fe135ef9241578d1a661ab6218af0299ba9d040ee67982
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised WordPress sites, likely to download further malicious payloads. The embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crewmak.ru/uplcv?utm_term=i+am+number+four+book+2+the+power+of+six+pdf PDF link annotation
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/b9t0v8k21q9od7lca72r86j447/28974601303.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16219975038822.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/857e6195494db16b502290cdcc1c6051/3746272542.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/36787634200.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5ea28ce2a7683f31abd98dbc8a9f25ce/banemotu.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/3226506123277291a01bd01cda2bba9d/mefuselutapa.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/28062d207cd8166579a8424f11228393/bovonuviguwuxabepidi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d3abc5392577e1825a1766221533c94f/xaduguputezupujelifa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/924cea5b53e3a713dd725780ff53132d/zabedodedase.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16097d57ab4374---70247645098.pdfIn PDF document text
    • https://migger.dk/userimages/file/50929070529.pdfIn PDF document text
    • http://mwflower.com/upimagesfile/%5C/noximivaluxobutedil.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/93485435863.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/73730226771.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e1cee955---69591922937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 5680 bytes
SHA-256: 00e9969fa85efd8764ad9c7a472c8804b7838bd54eb599bffd76d23529da397b
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 10892 bytes
SHA-256: 1f2c6a0d831f0d89c10d9c170d8562a6d1ae3b9d5edd3078b9f48aa9ae479fd9