Malicious PDF — malware analysis report

Static analysis result for SHA-256 4609d5de1b866e51…

MALICIOUS

PDF

91.9 KB Created: 2021-06-10 05:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ced5c1e2fcb0deee213f81b99e375db SHA-1: ae7c2bf019916c7f4036165579ad147cab3c2b96 SHA-256: 4609d5de1b866e51e050bd1a03c8fc9227f3fd537cc60d194e8d14369a9d8ae7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns point to a phishing or redirection attack.

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 https://pistant.ru/uplcv?utm_term=basic+skills+physical+science+6+8+great+vibrations+answers
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nk34noral2eiep342861spvpk8/77055127785.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90128853b---76998393619.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/eac75a51e021a5ff7e60a30e3a0819b5/4153347097.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8381e9e14f---11198669235.pdf
    • http://okuninka-biale.pl/userfiles/file/piselepowunoz.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/bace58b5c335b784829d3f04b78868db/35538782339.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ph0r2vt6dkkorbvttsckqvb8l5/76529336151.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/bpfrjq1od7r5990si379otlsvg/1097562979.pdf
    • https://pima-alarms.rs/slicice/file/midelaworozuj.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5f6964c0---34062298438.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/077c977ab64c61b8ca958f03cf0f69b9/xixube.pdf
    • http://giaoducvietnamtv.com/images/ckeditor/files/48254610339.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe97cc193b---savapuzakivimerusiru.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/tepuparadoxefaxis.pdf
    • http://akcjonariusz.com/UserFiles/file/62164199984.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c00b42ad---telatujupesezububonakufi.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a1ec9cf3d749e1edec60670fb649c977/23107192483.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_off000123e2.bin
82de0a284d06853f8c1eeea75aa417f1556ed4ee47e7b2396f86dedf76fb0523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 6048 bytes
font_01_sfnt_off0001388a.bin
a93501adb78369500c7066072603fc8e457f8a61857d1e0a985bfebdfef3a458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 12732 bytes

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