Malicious PDF — malware analysis report

Static analysis result for SHA-256 2797c0c522dbdc59…

MALICIOUS

PDF

119.9 KB Created: 2021-09-06 16:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4e061a7603eb3415438fdd5342d7278 SHA-1: c8cf7a0fe15eb7cd2c76dc33461120fa273a0d37 SHA-256: 2797c0c522dbdc59460c8ae12b786d435f7de2d4139b9b0d34db8cb7070891d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0) and an ML classifier indicating maliciousness. The file contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate this PDF is used as a lure, likely for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=politics+in+america+2016+presidential+election+edition+pdf PDF link annotation
    • http://www.physedu.in/newsite/userfiles/files/samobubigawemafufunu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/64hqjvj0gv2nj663jbjgop6771/61200849076.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/rakanux.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/juvoguxuwimu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a00fd2517---tozupaw.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/46346633728.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d136e4fc7a---fanamez.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3c6be7f2---44167247324.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/90620685685.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/22854266961.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5d97ed117dd30094c240efcbcf130a63/vovimojuxapuwu.pdfIn PDF document text
    • https://aashianarealty.com/file/fupizajudomoleduginuz.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/fc38674c47b9cf3598a008bec6e4b691/61793120642.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/nitalofariliwilad.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/gerasunotodisati.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/jexokubaba.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3be21e082ea29bff7ab9d8364d3dba3b/gagepenodiwexomivo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e150ac0463b---molomarugonuzabafam.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612041ad453f8---16700937294.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/812dc247cb7cd09dcb2d7914a571d830/37619568802.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/16e4e7871784daac4dce06bcad4a21af/1824079429.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/mekopijivum.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fabf5c00de0f0f442109e1f76d67cf19/37618395035.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49c9e78b84---90119054169.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/karuweda.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/58588122888.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_off00016d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001855b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1855B 18808 bytes
SHA-256: b0d6398714050ae63e0fe7591ceeb468785a65ad6ce297cf6d01c3818e38f478
font_02_sfnt_off0001b642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B642 11244 bytes
SHA-256: 9d04fdf9be401daaee1b1f4ea1eacdecb21ea058bc82324d70481d5096240ecc

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