Malicious PDF — malware analysis report

Static analysis result for SHA-256 9139f185616d2e2d…

MALICIOUS

PDF

72.9 KB Created: 2021-06-14 07:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 92b79c02479ecc34f2f2aa5aabb15fa9 SHA-1: 4984e399e8797673ed49464a5e32f4d582680d68 SHA-256: 9139f185616d2e2d470ecfc8b190f2f5c4df4bb4504fc22bf667d2a8c26c956b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics confirms the document's primary function is to redirect users to potentially 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://chcial.ru/uplcv?utm_term=bob+books+free+pdf+download PDF link annotation
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/kugivix.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a269d6dd0d2---49000375601.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1st6sivhj19j6nhp2irns0nm20/zuxusago.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/50671033127.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/28047358760.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/o84vqr3vtmv0jrtm3tm6nudjh7/23527704838.pdfIn PDF document text
    • http://nfc.soo.jp/file/28427393392.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7694e9af---kavabukemixaxi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608147176f3b3---21803641752.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/fejawozutegezogozuj.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/d3jhod6m9d61muqaqjnlo4cc7h/jujulelapamemim.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/44795412916.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c4e747d5---74891759942.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2737530963---zipupijavaxilibedimezer.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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 5380 bytes
SHA-256: 80817ba391c6bbaf3f49fd42a7ec2f562a47e07173be73a50fe818ff757657b9
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 11448 bytes
SHA-256: 1f9d37dc0cfe6b350d08e56005fba87954b187957dfb419ddfba8415e64f0bef

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