Malicious PDF — malware analysis report

Static analysis result for SHA-256 732a27ed4cd39b29…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 22:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9f3b3fcc336c2fd8ea3bedc8fdaefa5 SHA-1: 321c28d66f8eb218a0cd1d2b6c83bacc0babc443 SHA-256: 732a27ed4cd39b2913e9def77d398438ce04b0b0dfb70982db9bcf6999c8d60b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://garglob.ru/uplcv?utm_term=techniques+for+teaching+listening+and+speaking+skills+pdf PDF link annotation
    • http://asesorgubernamental.com/images/file/23388105079.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3abb2b4569f4d83bb2817aa575c1f6df/74658621150.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/gad4bvodeogo878n2a0pm64c15/lizilasixevupuwilafewil.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab262187738---16622509504.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/26211642463.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/pobaxuzuvidane.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38083cbebc---zokuzafimederekakijuriw.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/kasalatolafipu.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/moxejobolutuvawiza.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///12449990458.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53149114186.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a408364e55---8949201152.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/barib.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/bvd8hqnaim1qd5eos0mf0u8uh6/kufagokizad.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/27818992659.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/08b8ff62d1f1f0629687131df0f18a2e/kakizukigudowimum.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e709f4d7eb---77149523875.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c0fdda434---7585515762.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/voxipilevobak.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/dcd1271703e191562e6518b4fa88c9dc/55835577768.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eecad2bd91---ratebafewizufularirume.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 17128 bytes
SHA-256: f2a7fae1846ca162f7fc0731c77d56dd19b8c4c70321a5241777a815ab188b71
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 18140 bytes
SHA-256: 9d8a084378676d25ee7b2e927a783650ab2b5fd3e914fd51d43815502dc0a9eb
font_02_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 11200 bytes
SHA-256: 180d390ec3986f0b465d89cf242150adc3c768a9825fb2a3a21fc99959b3d3dc
font_03_sfnt_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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