Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d672bdfe3da551…

MALICIOUS

PDF

81.5 KB Created: 2021-06-09 21:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2a09298e229ffab905bb6cba30f0fb35 SHA-1: 8a1c86de0252b4027f6e267c618fdd10545c3247 SHA-256: f0d672bdfe3da5510661ed6ad15f1e2e300728699e4625d7ad0eac2d3f12072f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing and potential trojan threat. The document employs a social-engineering lure, instructing the user to install a browser extension or update to view content, which is a common method for distributing malware or stealing credentials. While no scripts were directly extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms and disposable domains, suggests a link farm designed to redirect users to malicious sites. The primary intent appears to be user deception leading to a secondary payload download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=free+proxy+addon+chrome PDF link annotation
    • https://arvikabc.com/images/uploadedimages/file/64489190053.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/lewolidinugonoponelir.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/lomuluwirixi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090476dccbde---tibaxodikun.pdfIn PDF document text
    • http://teplospectr.ru/images/files/jamesikunatuwited.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/p2ai5bcmhb3d6jvj86jadclm22/pikefesuruxuluvutodu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00793d6a6e---tuwajizo.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/55591281068.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/50313454370.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5c719e341c704ed8c9f5957ac5d1440c/72886819674.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/61874748847.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/89006c5190cd99113ced8a59d2d2ce29/15042518032.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/41516233622.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e8a539fb---88086272252.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606feeef64056---mekagolutaj.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092dd869fd2a---86444839551.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 5228 bytes
SHA-256: c26d9eb70f20c0057518adac15e0f255cd1b16f93369eb3daa6d0e885e1f5ae7
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 11740 bytes
SHA-256: 1a21dd0953b99a0bc22ac97f71653d4129aee9821ea58eb2ddd6d56ee7b9a2f1
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 16160 bytes
SHA-256: dda6da2d3ddec570341b9ec8ae47e728c3f43cb2aecbe4f9b999b8bc69945a05

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