Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73cfdb402dab7f1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 08:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9fe9e019abd5ef0af2e53287d1c8091 SHA-1: f842375abe5612e9ff107e5af38bbcbaab77273e SHA-256: d73cfdb402dab7f12acd36592b31d96eba67d634c6719ba34112c6a1a9888327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=gas+shape+and+volume PDF link annotation
    • http://msslink.ru/userfiles/files/96247877737.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/34129216736.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4d085f0d---redemenosofozegamitev.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731b9f4601b---47252690580.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/mozanolexaxulopubekajamed.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105fb883a7b---63591182819.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/500a29f041ca73e89495eeef5b7b667e/57314720989.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796e81dcf8e---55523312022.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/53535859993.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/veruziwi.pdfIn PDF document text
    • http://p-energo.ru/content/file/2890646084.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/67481852377.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7a44eadb9---63796723279.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160960dd1a526b---zotomupusegokodaduwuw.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/72708414629.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/66830363339.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210821163535676.pdfIn PDF document text
    • http://mp-journal.com/media/file/96435057711.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/lug730jtupp98r57351mhriu79/bejajuzadibibotebativ.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/65b0abf1675ae983bb8f3d81e5145c98/pisuwuwojidomuduwirorexi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e606b0a562a---63467320544.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/59511f4ccc09b0a0c938efa5dbd36ba1/33007457379.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/60235201670.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_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 10572 bytes
SHA-256: 90553f6e882b1d80f8f8a673897a2fc6a930b5edc5f8b480d0c4c4e18e1cac29
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 19964 bytes
SHA-256: ccdbfb972416be4089d31fcc65a6c8a92b0c805160ebe809f5cbcc8e5d7592b3

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