Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efe786aafce6bc1…

MALICIOUS

PDF

88.6 KB Created: 2021-08-13 14:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27e8bbc2c1c1f77495b3597199927e91 SHA-1: 2acb714091439c41cb490904bd2337773b6c8303 SHA-256: 0efe786aafce6bc177e3714b5d22a1b27f0b35e494d91541146c4c7d43dfa68b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious site, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=how+long+to+cook+turkey+breast+in+showtime+rotisserie PDF link annotation
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/79557757810.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ae287e501050948a50cfde97658aae93/39957922383.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad5a3e4bf6---xazuzujugomuxexapik.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/kebesomep.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/topubezaxadelugujib.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/bedogutirewed.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d613c9f206---21501687559.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/jizosuzusunuxixaruwa.pdfIn PDF document text
    • http://belv.ru/userfiles/file/18475365579.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/1002316866.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d65cd5bd3---lopuviba.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/15697117181.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d8eb35289c758ee67a63a8353acd905c/14594547506.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c3312e89f07---pozafamoxo.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ed825803346b172875731d2aa99bfb73/65676203103.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/48769748897.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f4bc27dd7---77638885176.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/17531588263.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/2985166718.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/024a0bbb6f7675b3a83243760ef46771/tozotufepajej.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c81e5548050abe3057667dd91cf04607/20661086664.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bdgc403f2dpgbj40oqv4t9redo/julubotunanejeronana.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2b1ca5e6f2ee06947ee20cf26e23e1d9/57351680186.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 18752 bytes
SHA-256: 518ad27a71ed0592dc3d56625c5afdfc3af515cd18b3a5cefc4392bcab34cec7
font_01_sfnt_off0001219a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B1 11200 bytes
SHA-256: 6775ed3a610724cc5037a656cd4b1f616b26df5875ecd84b604930f13cd5d291

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