Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9042a2540e3ee2…

MALICIOUS

PDF

105.8 KB Created: 2021-08-14 23:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f20f7a109e87577b2aa36b66b9ac0201 SHA-1: 75886fc2f4a09d83535ec48c977bdd537dd4e839 SHA-256: 6f9042a2540e3ee2d1baccecc2d367ce420411ab9941aa9fd647f7533cbd071e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=worksheet+1+subject+pronouns+and+verb+to+be+cevaplar%C4%B1 PDF link annotation
    • http://wildpflanzen-planung.de/file/39864608412.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/edf95nbfpm6i321jbv9atvmpbi/95293357207.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210619210019_mx95gs.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/30132125451.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5b223266424484f39d9adceeeb46b10a/mavoxa.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7e86ilsh2v97rfl8khm80219nt/dojajurezolubuf.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8a3cba41d67692a1e4e81b79e20d2f91/44030724092.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/49b9aafac0a5dd51dc980ef9ceea0307/jafuriduxipi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf6e65b97---41933424014.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fa95d3d6cf395bd3a0960a8f4ad1129d/migojusuruwuvinuzo.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/junitan.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/48627641764.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/85830319898.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2f0184e43d50d936e2010cc429e4ddc2/birodidatuxozogut.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/69627537182.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11890d4f7---punotixifisofogemilo.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/judikuwuxevexazolira.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/7df0634ad8d3a4848c0b82e8eaaa4304/73784295877.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/13622074936.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fa3141af8---47541339790.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/25680669442.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/takawilezigonipe.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/2182442822.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB6 17456 bytes
SHA-256: 9231e10ea943dae94aa8fbe76ca61408c3d71c987ef4e3b7f1e9879eedc77139
font_02_sfnt_off00017beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BEB 11140 bytes
SHA-256: f56c0316a1f682cedfe55bc2cc17c26c6b1769c39dd8d649acaf4f90befe64df

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