Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d718f5f8f1c634…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 18:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9a5da2d2f5bf41e3e07ce9331d0ac82 SHA-1: 2bfda9869c6a7cc6b01977ef4a22b3b613bea57b SHA-256: 81d718f5f8f1c634bf930c773e59d29c71d1aed567d342ca31babea04c31ec34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The primary function appears to be directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140abbc98e5d---fezesowenisubav.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee8420bb5---64485527249.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3ddf7c59062e55e4416478f2c0532cb3/kobonugojul.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/46382215351.pdfIn PDF document text
    • https://autoskola-scp.com/files/niwobu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/33515206433.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sipedaname.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/zowipom.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/mifafix.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/7830364503.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/2194519956.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/darusuv.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/gewin.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a079345d1c---11441708348.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/90115933051.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/alcs6cpr5vdlvk9r6nk7qfto4b/36849280778.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/dipowezaserujiviguduwu.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3a9006909f4802fa079b44fdc1594543/84576976515.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/92169635017.pdfIn PDF document text
    • http://houselandia.ru/files/56360607682.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161448a24938ab---pitibilukesix.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/30958062121.pdfIn PDF document text
    • http://rubensova16.cz/files/file/gejitasovon.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vunoriwu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2fee47a7d---94982501046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=jurassic+world+the+game+cheat+codes+for+androidPDF 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_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 11100 bytes
SHA-256: aa6c43a630103041680c6a29b783dcff4bcb92dfed1a5855c9c4eade7575d803
font_02_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 17240 bytes
SHA-256: d4f1d4b2c358acbcda8ef2ce60f49502366cf82cb6273387175657b02c49b494

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