Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f62bcc9fcae326…

MALICIOUS

PDF

63.2 KB Created: 2021-06-22 14:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fd2fce8c93c44241415241f973e4ce8d SHA-1: 1d4149399f80976b9505d7dcde30a644d5d8b515 SHA-256: d1f62bcc9fcae3261663dd0fffe2f27c37e02481421e96ed70be7edb6ef8c124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous suspicious URLs hosted on compromised websites and disposable domains. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the document.

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://medvor.ru/uplcv?utm_term=life+jothe+ondu+selfie+watch+online PDF link annotation
    • http://seoulsquare.com/userfiles/file/15475800401.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/802bf96d89937c7690da4258d951bc08/42299850312.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/89769322344.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b907ce1fbc4---98239228089.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb3a2df17---44108725805.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/422f489dab78bbc135aa17b33b812b9d/sepodubusefovo.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/kubumogesuxevunaju.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/mokunokekozarug.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c024194fd7b---85218179503.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/lerijafaduredewusoredulug.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac298c27b1e---65993253902.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6852c87ca---57435110128.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160975edf4b2bc---nagirofiz.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7eb1c1290385db8b1bd57d443a2694c0/ruroxebibofizame.pdfIn PDF document text
    • http://aweibel.com/Photo/file/21553721993.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_off0000bb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 5120 bytes
SHA-256: 0d30ee12b3dfc28d936a34fa2e9ec364d790cde23737b1075d4b5c4ef5d1fa79
font_01_sfnt_off0000ccab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 10188 bytes
SHA-256: 2f3d9c25961fe3b0ba9a51f54009bd41fb33f3c5bfe865652f44a3e6704a297f

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