Malicious PDF — malware analysis report

Static analysis result for SHA-256 769c4ed92dae1b02…

MALICIOUS

PDF

74.2 KB Created: 2021-06-21 04:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d31ee39bca6f016a67b4abca10abd95a SHA-1: 3b52dd284f82af54232c59e146ec688813942271 SHA-256: 769c4ed92dae1b029944ec979fdc468a0e4ff5ecffa45f6fa32f38718431e405
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains links to compromised WordPress sites, suggesting an attempt to host and distribute malicious payloads. The presence of multiple external URIs and the ML classifier's high confidence score indicate a strong likelihood of malicious intent, likely to trick users into downloading further malware.

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160823ad794d99---bijelolezizubabugita.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c483125a552---fisamog.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/252558ae1bf73c4f3d6aeffd6578ca4c/32299233543.pdf
    • http://cedule-plachty.cz/files/file/33792246794.pdf
    • http://quaretti.it/userfiles/files/duvugevoxenigafij.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/82873fe3ekp38ncn9c22qnrgrv/68604922424.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16222969876309.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607307821e775---49405162519.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4su8r49oah7dlnhp78ggdaqc56/filogojarawa.pdf
    • http://dush-kz.ru/uploads/fck/file/nedukejoge.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4e20531a61b045c525a4ddac340b6def/86656480164.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/98875f29da6cff939dd7872bc8e1fc29/vudis.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/61ce6ebe864e441ac24248d6f06b0dae/zolopimiwesur.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/aaa82f69ea3ec2b9078b8884427e07dd/fenati.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1fbe2c67---170294701.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=monthly+rental+receipt+format
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b2.bin
4da409568d48e15ae539eac6e7cc6aed14257d826136f57886d2e0c3a8b87178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 5184 bytes
font_01_sfnt_off0000f543.bin
7b6c428f52c28cc89a82494fcb7a1d2d3003d32f8ed2b7907cfc73ce09bd836c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 11296 bytes

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