Malicious PDF — malware analysis report

Static analysis result for SHA-256 84741356abf2d26e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-29 02:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b84227afb5ac5e233ac878050f183011 SHA-1: e501efa41e94aebb42f3809dd4a18c7bf5236bf3 SHA-256: 84741356abf2d26e09c050482d5c62ef28f9f2bb8ce190752dd46fd849939967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=parts+of+body+belly PDF link annotation
    • http://phelieuviethung.vn/upload/files/77964870538.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210920_173324.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/53112696509.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/gazafaxiri.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/zarujifejefisuno.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/vafevuwoxuvegovufev.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/80876590405.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/libamovenisunikixefi.pdfIn PDF document text
    • https://goodline.by/userfiles/file/35192739771.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/74677682923.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/wexemapolodupujiwobon.pdfIn PDF document text
    • https://digireg.dk/upload/jadesizugojikenax.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/lupuvefoleletovinetafe.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f881890275---fakugilonomopezamijetepo.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/6391723010.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210925052052.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/67905826745.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/33367287103.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131beedea452---dazabel.pdfIn PDF document text
    • http://minipit.com/data/files/34810949278.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/2080897221613b9148b851b.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/66508277788.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/zobexi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615384450ba6a---xoworademigebe.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_off0000bf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2D 10408 bytes
SHA-256: 06fbe0d41d46f5a063b0b2919b80270170c7ff1efa42655ed227a4fc0bc2a7a4
font_01_sfnt_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 21948 bytes
SHA-256: a985a878a3e152a756d47c620a7904f24ab12c390ba511d8e29e126e8f446bcc
font_02_sfnt_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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