Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd716ccbb06c9ab…

MALICIOUS

PDF

72.9 KB Created: 2021-06-09 12:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd631409b8c5612d69a4a0921c924087 SHA-1: dd088308fcfeead7200e1d8e4b9c805d9ea93e4c SHA-256: 4dd716ccbb06c9ab372ec5a56d2659c42990a93ddc8c88c564ff4d66c4f7386c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=ssbbw+elephant+tube
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160802d9f931df---12851384653.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a1519a9d2---lenes.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/pasubezofajonopanuxax.pdf
    • http://wittlich-luexem.de/userfiles/file/dowul.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a325c9149---76138496959.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04ebcb4abe831881be6e12f79f965e04/vipedavilakuwej.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5e90974f---50905352361.pdf
    • https://gregor-biffiger.ch/userfiles/file/nemojidebajet.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ffbdba9958cda4a02d4fdae7a0167beb/45912917956.pdf
    • https://grupahatak.pl/admin/_fck_files/file/27972277259.pdf
    • http://aylincinarli.com/fckfiles/file/guzegepoxuja.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b457a29967f---vawinibosaxidaga.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b9a4ba8d---10668020714.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/84dc7b15a8f6a7188e8d2ced08e820d0/81650379179.pdf
    • http://robalton.es/Albums/images/file/%5C/87224288224.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e278.bin
9ddf5e1d687160ab2ee69480d96dd27ed5e38c770d25fbaaf0ef4a263d3e9f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 5144 bytes
font_01_sfnt_off0000f403.bin
72861334b68f089a7bb1a7ff1ab95336e7e7d890c42f9e758e79b8bbaa1222ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 10348 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.