Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bec44a5c0c54cd1…

MALICIOUS

PDF

74.3 KB Created: 2021-06-20 08:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 26ab8e6bc84e53f3858083ef7d0e4d08 SHA-1: 0ce786be5255011dbde037c064cbaeabd003503d SHA-256: 6bec44a5c0c54cd1415193eeefcb3a86940b7a7530118afbfcb05003858a020f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading a payload, possibly disguised as a game cheat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0a82d5dc---47144984905.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/fa9c8651c6f614eb2d4be7e6cf2b39bf/buvefapibugutuvajef.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a16b2a0e5f---lokuzuvavupaj.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/92ee4ff1090dd1d0fa846c2190667401/49929400894.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a2d92afc80aedd3bd4e4e9250afd9cf5/4446233817.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080338d709ab---32031350893.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/5885924519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e48a06814---tesiwisetivenegemuger.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/nivaxinupogiwu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c22672a7---fagifireranu.pdfIn PDF document text
    • http://aweibel.com/Photo/file/97719729759.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/pevepe.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/95813445069.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/zifurujadoxegunasifop.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89b7684980---30386393870.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866ae6e6889---jonefudabudigogipilipe.pdfIn PDF document text
    • http://ropesadventure.com/d/files/nepezipejokodelokar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=subway+surfers+cheat+apkPDF link annotation
    • 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_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 5572 bytes
SHA-256: b470768d9be447ca325ab5a618d5958a629838bc356aed5770945e0afdd0e0dd
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 22444 bytes
SHA-256: 01355195bf90836183943172c70326f15897e0e17db6f1f8665c49afbf4dcb5e