Malicious PDF — malware analysis report

Static analysis result for SHA-256 db904a4fe6ce539b…

MALICIOUS

PDF

96.9 KB Created: 2021-07-22 18:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2eec2a30afe61208ec9cb1a12b4cf4db SHA-1: b34a4ede2f52895a3464bf48a9059756ff2afc46 SHA-256: db904a4fe6ce539b693699b974b95ababc861e8888705ad4448133231e52e0a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content, aligning with common tactics for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/14576566314.pdf In PDF document text
    • https://chennothinterios.com/uploads/file/zuximajufevateni.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t03q5mhllqnub3uk6a7hioe0hc/67005594624.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/zasomepupek.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zosotoduxuxeno.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/dadulazunu.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/3486355096.pdfIn PDF document text
    • http://didopack.com/files/87798288322.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/23g94p618mv0obqpgrnuvc62a2/57188815007.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/kupukaxededorarutekep.pdfIn PDF document text
    • https://mauspro.net/upload/files/49394467891.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0a27bdbd59d197c4fd488ab9d956ea1d/79777408519.pdfIn PDF document text
    • https://nevisnews.com/userfiles/41008927221.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/73337341287.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e11288b4---tadinuzolorefibetugifuno.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/lafaxateneboboluwijosi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/75a90284d1266f2cf776250bd5dd9fdf/20995507179.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/ruxetudo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd7bcecf9---varelututidelipukefepoga.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160729d75162bc---16042002890.pdfIn PDF document text
    • http://runo34.ru/attachments/file/narewusojovigusozokugat.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f189f9c897---pakolijor.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/28455249499.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91058364f---47953515344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=training+and+developing+employees+chapter+8+pdfPDF link annotation
    • 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_off000115c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 17388 bytes
SHA-256: f268ae39e66ac34a9a1a10d49b54696ca27c6c90ecac1f93ae4ba8b87e427078
font_01_sfnt_off00014299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB0 11420 bytes
SHA-256: ed06aa67419db5a0ae41218ecd660a4a479849f6783774940cc79ff880004ea1

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