Malicious PDF — malware analysis report

Static analysis result for SHA-256 578603158b40a3d4…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 04:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3a02ed2fe2871805b3fbceb855c238d SHA-1: 1f72f24c1ec33e798317d2a75cbacbf409d09e3a SHA-256: 578603158b40a3d47c06d513f7c283b077ff6b2581d77248b93102bcd5d2dfb0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress installations and disposable hosting domains, a common tactic for distributing phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan downloader. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=theme+of+ancient+mariner
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d80d90a7---kexuvisumesemo.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160866f13c0c56---nuzavuvijabadi.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/020kdv3h4gsa4gpdacfjgrp2ph/88275613956.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a77689ac817---woterixuj.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aa2585a28845ac3b0ecd0a5314ea6e5e/sunigulopufotimavedoju.pdf
    • https://299-45.com/CKEdit/upload/files/98288803203.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4ee32de6e549ef861e5c44267e798360/84897370209.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607be975889df---62378595746.pdf
    • http://aklond.com/UploadFilesfile///2021050520302797.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd75e6831---pigawarikisiduwezadolapil.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a780a2bdc1---73407064685.pdf
    • https://amd-export.com/site/upload/file/diwazafudezokofa.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10b3b0dd5---pisorurepoxuxilimen.pdf
    • http://honda-vo.com/upload/file/17293157842.pdf
    • http://www.asslar.de/downloads/jibutekezabekuwugapa.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8c58ed2d0---wogulizodivofekedusi.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/tumuretobuge.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaaf.bin
4b5c30810c1beb4ec6b4ca7b645b62311aef36e147d5cfd742be21a3293fecaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10352 bytes
font_01_sfnt_off000101e0.bin
0c9ac0ede5685d1793050bddb4a22eb9565266c96e0151bef712dbf7d52a9a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 16912 bytes
font_02_sfnt_off00012d3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 16792 bytes

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