Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b227868e89cbf…

MALICIOUS

PDF

66.8 KB Created: 2021-06-11 16:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 56e0caa05b6841feeb956e0d7a64bbb1 SHA-1: 7e904a901efc7dbe698b8fe84785d1102d5bd59a SHA-256: 8c4b227868e89cbf1d21028a5e8aabbd62739a0d779923a4a9e356da1f7ea669
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=zuchu+ft+diamond+litawachoma+audio PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8e34b6820---juvagopariginef.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/povonumebezufilisowe.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/darokebaxowumojimuwozab.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160833294a484d---55774097313.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pifurabosidevajesat.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/51529295338.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vopux.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0cba670d---66879183314.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n4o4q406mu8lubrdrlcbrt4qs3/39321422400.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/biligozofuvogozu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070532ca8641---pafojiwoduvupu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/bdaf79fe06b26f067d5638b5247f9b67/6727527752.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9be468d87---jemilolitatuvisigaxu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/caed7d0nnn8m71im3hipabj03h/92796378152.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/51107236811.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 5036 bytes
SHA-256: 213b903bbd5f3d431e71e1ee6c3300b209e3d138fd8a3a2d5a34de4ba45456f1
font_01_sfnt_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 10984 bytes
SHA-256: 0fa819229a560c6d1f4947258d67856f5618d1db962f0dc7ab2d0a871dd42c13

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