Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6d51aaf2026cf2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 09:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b852350087db0119bb61d6d7567697e SHA-1: b45b2fbf80fbc6048ed7690f2feb03265363030b SHA-256: ee6d51aaf2026cf2a78a884e688bb72a6dea0ac6dbdc8b9039959d0a72acda6f
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, some of which appear to be hosted on compromised CMS platforms. The primary attack pattern identified is a social engineering lure, instructing the user to install a browser extension or update, which is a common method for delivering malware or stealing credentials. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=dark+web+theme+for+chrome PDF link annotation
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/42600320496.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/rujojudoved.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc63ccea5---86671920442.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/99717040253.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/dovojenixojivumaz.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9f5a3cf2---15811123875.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/xuforapezexesexedot.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210905111410_396626064.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/7112631206.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fiderakafenigakekar.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/bosisetozosixurapev.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/vebefusidepolupesofe.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/925ccf6449b28806feb447d70589ce9c/fobazasudaje.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb82919a9---mavuviwotez.pdfIn PDF document text
    • http://ubest.ru/images/file/wakotexifajitoro.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/salijebimurabulaf.pdfIn PDF document text
    • http://minhanh.com/files/91172953690.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/63143960748.pdfIn PDF document text
    • https://blokhol.com/upload/files/nofipeve.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/kagumelimaketas.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/majewidisala.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613180356c6ff---gegalu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd15d8386---ronumama.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/kuranugubozigetasebuxuvid.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/65000888358.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/20469423315.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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 18016 bytes
SHA-256: 1fca787f01a18af8572aca701ded0a12a3545b7f57ce46527c7b38bf6bf1d7c3
font_01_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 10508 bytes
SHA-256: abf0397fa9dd8c41e49939acfd1a1597ef4a88bb5985e96cec878b222e613b0c
font_02_sfnt_off00012819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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