Malicious PDF — malware analysis report

Static analysis result for SHA-256 983a03b80dca91ca…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 15:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6c920c1728eecf1a88b35a8c5ad75a5 SHA-1: 6ac4db2f50ff54fa044454d532caeb773ef55242 SHA-256: 983a03b80dca91cad916c4a34998961694ed4d8e7a353ccd6805986746a245e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=letter+k+worksheet+for+toddlers PDF link annotation
    • http://mpti.ru/userfiles/file/59034582152.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/86179452828.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b965cd5faf---dumula.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/nezaxol.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210622165358_m2ioom.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/20342370285.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a951528a381---felofujezelov.pdfIn PDF document text
    • https://andana.us/files/files/55579536682.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6456d49409---24116483873.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/volexamiturizaxe.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160cd86c3a4de1---67996679784.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/582cc5b1b1e0c5dbd47817d296806837/25105017365.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/pexezu.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tutusoguvisezo.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/puwezejagoradosuwodif.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/pukotarejinafakozasojozi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8aeed9d7---23951708623.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdca3bd0f9---pirutoguwanubelejofup.pdfIn PDF document text
    • http://jarosi.hu/files/file/dipapejebeviboberoro.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/sudufamurojewuwizesa.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f319e9d10728a830fa9d4dd06c594b13/gogosudugekafowujenamu.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/16261390714.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090823e474bd---valakesomatupa.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/40323006824.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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 17644 bytes
SHA-256: 0e9090830c2501d7ebc7273ec920b1ad77086c5ad264c47edea01363ae3b11cc
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 10228 bytes
SHA-256: c7b226b24dfd3ceffa1d83a7019b029eed32b857f114a653010bbb13614ec999
font_02_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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