Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3ab58da0796afe…

MALICIOUS

PDF

68.6 KB Created: 2021-09-15 13:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88bccf28194ffd22faa4f58d5734f924 SHA-1: ad36df69af17183415f8dadac97a6903509da9e2 SHA-256: 4e3ab58da0796afe5dbdae962281a62cd050029609c3345c5129e3cfa1bb5d71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to numerous external websites. Several of these links point to compromised CMS uploads, indicating a potential distribution point for malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://saraiaser.nl/userfiles/file/63468911078.pdf In PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/585302320.pdfIn PDF document text
    • http://carszana.com/image/upload/File/murezekosasezufo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613380ae328aa---31014112967.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/86316162171.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea3119f632---kibaluxor.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6394c839---20453933956.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161395ace45a7a---6003028072.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/92137818077.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/tipatujebo.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/pelaxoworigusilif.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jivefitor.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109120943299418.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/30632769350.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090811491273499.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d9e427beb0e1d21a9f276d21ed4079a8/zopinizaf.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/34967850183.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/72274454295.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/pojapaluwak.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/fagadozipajavapazosok.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/tisejonetenoxo.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/nifunivazepiwu.pdfIn PDF document text
    • http://elsped.hu/files/file/67370900265.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/49982566198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=where+to+download+movies+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 10764 bytes
SHA-256: 8fe0b098c44f367290647c457938a2ef57fb7dce28b01f6ec4752be0cbd00e51
font_01_sfnt_off0000c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 14280 bytes
SHA-256: cc978c2a5e7ce968a35aa4dc7baf9a92caf33ff7dffa02bee45b35432c2491e0
font_02_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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