Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d949f9869038b7d…

MALICIOUS

PDF

91.9 KB Created: 2021-06-25 14:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 886f32424177b83c58611d09213e540c SHA-1: 0af4717a2b391ab7b0788ba2ce3276259056bae8 SHA-256: 2d949f9869038b7d20cfe8566fac2fc1336c9219d05e4e6a4b511d4ac62b83a2
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a browser extension installation lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to compromised WordPress uploads, suggests an attempt to host and distribute malicious content. The SE_BROWSER_INSTALL_LURE heuristic strongly indicates a social-engineering tactic to trick users into installing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/83e8d2d6d4e4219afc270a55745019d0/folekiwugokesezivejoz.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98877e92a---vizefesamotusikiroson.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc2aa7bea3---56844612033.pdfIn PDF document text
    • http://beateromer.com/bilder/file/xuzosetumigofaxa.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/13dba78712047eca4478477d2e091313/keruwaruwutibira.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/kepelurafuzigon.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/69102345654.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/denubos.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/nafigebukaselozonabatolaj.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/ragumawewigim.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160989893c0e9d---49991566709.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/51980865538.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/282ab4264e3268388d91a687ea539d16/wowigajubunem.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/66801751403.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/24829b981b33e2d8704b9153f31e1fb6/30833606046.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/podiropopiwat.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/rukigavunudikugatozibax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=angry+birds+hackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 23732 bytes
SHA-256: eb29c3c11f5e831c33a3dc8e0200b15060379742e68fee0caf1d70586dc4d258
font_03_sfnt_off00014adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADB 10580 bytes
SHA-256: f6bda9eb44994a0a87178be6c7b06e5725b85cc29675925f47ac20e4ad0e90d2

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