Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a5635a148f0120…

MALICIOUS

PDF

97.9 KB Created: 2021-08-12 17:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0cf3a8cad2a757353e5930bcbf2c774 SHA-1: 68cc2e908e29a2c1587997d5df3aeba1fd1f8791 SHA-256: f4a5635a148f0120164cbd40e91bd05ee4bd3ea3b853673a6bebb017b37215ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=pokemon+prism+evolution+guide PDF link annotation
    • http://ildungrice.com/fileupload/fckeditor/file/nakisisasu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/96023840587.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a898c0f3c40---finolazixemokiropusigixe.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/disimijidimatasawugasore.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/tirufiruxituwibizo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c61010b355789b08bd745fdf081a26f9/78939807269.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fgrdmlbis30g4sdoeqhab2n5jr/mopaforalenomesokal.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c53f2d22---29677807972.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/dafidumijuwemipunisuzod.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae49a1f6a6---piwupefon.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/55163964731.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16259147955331.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/38848243504.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ghclvf2dal77v0iuo79jofqst4/3292423613.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/81nhch34b7j5fsdtq8k509g3on/59545319603.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/dofenivavapipowejirikivo.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/pamotimogerodedamum.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/12824705214.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/63742d5ae1f92fa708b164095b2cd8b6/waresewof.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a19403cb20b---gikisubovibi.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c602a1bf695b31f96c361c28a95c30e7/13587275090.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/290916841.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a3b1c8aa500ac83d7c4d76cadfff01ca/93584824364.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_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 18008 bytes
SHA-256: 9ac152244db3569605e7503e2fe80c0e33407a4826661dc0118648186d784f4b
font_01_sfnt_off00014724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3B 10832 bytes
SHA-256: b003525e629ecf5a6d7c34e1cdba0b67d3cf637421a58f388c7efea44aed0b28

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