Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f492739be272d3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 03:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ccdeaf1ab30690ffa00e8de3ce1c46c SHA-1: 817a6173fccefb6f51152e3f2d4cef1e99fde7b1 SHA-256: 67f492739be272d32e9e811996a5890b3896efcad7f81b8efee7c2c2903f44c3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing recovery secrets or private keys. Numerous URLs pointing to compromised CMS uploads and disposable hosting further support a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://smidgel.ru/uplcv?utm_term=happy+wheel+for+pc PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vnmuekj8qda324gciri9nbt6l2/29505897559.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/todejafetew.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fafedd6886e904c4642477eb4b65163b/86462996993.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/98084360323.pdfIn PDF document text
    • https://armenia4d.com/contents/files/90489532620.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/jolamudobezodujifuvusof.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kuwutoxijenujaxon.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/12210044358.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/pabuxafob.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/figavupokevulinaduxo.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeviroxaxivemawatud.pdfIn PDF document text
    • http://ledins.lv/cms/file/dasimijifudo.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210903000559.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/kebupuw.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/16366136724.pdfIn PDF document text
    • http://kotolantopeni.cz/file/putopejutopot.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/jekoduwizovadulitaz.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/diruti.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/garotepamezinelizo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748dd76859---tisaguzofujas.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/lukiwosuredatujugapaje.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/37060129371.pdfIn PDF document text
    • http://limoride.net/gallery/file/jubabapazidavu.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/71631924504.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/mamidewumodazemele.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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 17080 bytes
SHA-256: 17b66316b0d2452773c7350b76c16ddc001912e92f32ae27d2ab53d0963e2cc6
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 10308 bytes
SHA-256: b052f770faa2334c7a2b2cd1c04a3b2d72d500cb7e9868999a670d087f62e646

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