Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd46ff71d61e9df…

MALICIOUS

PDF

89.5 KB Created: 2021-07-07 22:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a04dd0e566739d7fee86d39d558eb55d SHA-1: 9707551c2b72881f81d035595a8f09e80a3676b6 SHA-256: 8cd46ff71d61e9df7b481d8bf7154bdd40c136c008b6c43307834791f79d0b32
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609167c5f279e---83595232875.pdf In PDF document text
    • http://suleymanporoy.com/img/userfiles/files/92796097827.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/91317702498.pdfIn PDF document text
    • https://telenovella-bg.com/files/2623626837.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/28360769452d67a776526faa1007c10c/97495689795.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/tavimamesuwavasofamazokuw.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c7ce9e96---51525864277.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/93609436921.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee2bc6780f---faxales.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/tarakenuvolilamutibod.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/2323360102.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa321a4a701---gevokenanugazexula.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/82960909166.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/josuzazijabewapijirugovi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39db606b7d---48096481629.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a38c3d8a---wuxedidepagajufinabusiw.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bsk4hvnqma0566slm4ocmkeknk/70509475250.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/39011188821.pdfIn PDF document text
    • http://fygl.net/uploads/file/241659557173.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a4e01b9720318ce795c90438951eedfc/86621529248.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b04329a2---92090266218.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160728953266e6---13237003034.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c27bb288fa9---dukimodokagegubona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=a+shift+in+the+demand+curve+can+be+caused+byPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16996 bytes
SHA-256: 7e0a2f38925611aebde85ec27bb3f6d729c70e460e878c3fcedc91c8e8954506
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 10976 bytes
SHA-256: 6ed1eea975c547f8fbe56a010bd7257e4d4c5154f2dc9dab3fec9fc8a6e8abfc
font_02_sfnt_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000141f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F4 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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