Malicious PDF — malware analysis report

Static analysis result for SHA-256 280167c26b4f0df4…

MALICIOUS

PDF

64.0 KB Created: 2021-09-13 21:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a69d2a44f571fb2b3dd1ed06f0d281a1 SHA-1: 7f709fd3400a967c9fd67b7102671a2864ef108b SHA-256: 280167c26b4f0df4296fce3ecd03b12c82280e0c1bf3d27d925c5129d66954b0
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7802

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=can+android+users+see+blocked+messages PDF link annotation
    • https://leosservices.com/userfiles/file/9195767382.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/1420954663.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf208e0f7---85387791922.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/gizowadikufesak.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139175f866ac---lopevoxufetovodotisuzitaw.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d2e401ce---zomago.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/72362260793.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gizuwikojirukol.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/japetidedopopolojusosusu.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/rinuzukexi.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/jawatefoselikotuvunoso.pdfIn PDF document text
    • https://blugarden.eu/file/namadosutenapovoxa.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/52585886151.pdfIn PDF document text
    • http://allier-genealogie.org/File:/11388402471.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/96389584902.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/pijigixarifokukulofu.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109100306258406.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jokimanuluzikifinokif.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/biwasumujowizironuka.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/pimoxumegowo.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/latilenadopesipe.pdfIn PDF document text
    • https://vzglavniki.net/data/file/30305279217.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 17540 bytes
SHA-256: de85bb4a97e86b9b0faa171b1e5acb7dbe6b3c46e60da952cc31c7158a3b32b0

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