Malicious PDF — malware analysis report

Static analysis result for SHA-256 f275191ddfe7a2a3…

MALICIOUS

PDF

83.1 KB Created: 2021-08-22 01:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f779a3bebc6fd8505d25fa9ac6d2ad8 SHA-1: af510f86e681e88eb8100093101a7de6d6ba4346 SHA-256: f275191ddfe7a2a3f950b00d389206f23108c49bb8af67834be2f3a195b37a6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7825

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 http://hzjksj.com/images/upload/File/vekudezaxatobibaxikigajud.pdf In PDF document text
    • http://originalcheck.it/public/img_admin/file///44696326001.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kofusikadomotumagif.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30a534f300---44888903786.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b299d427f38---46023997925.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/37023996252.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a3811e499---20804316209.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/4949961457.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/bopiwofebitisinuvoxasikal.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd8bf650b5---99402093025.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111d9f8b8a9e---42312441695.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16086130570bcb---14540319669.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/70762623880.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/276223be40c6104b5bbcbde80eb59563/92850493707.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/36tpbkss3fc5ogp03dksrku4hl/ladegutuxujuzopireg.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f0643abac5482111aefe6b51b40e0cf6/75616358008.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e7f02c8903205876b06843a66a66dd1a/5828277909.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/simomarudiwuriwopedud.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/gamezusometo.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/benaverulagagogemusuf.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/sufimarojawajikuf.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/69073906a8d1569d47832df19e89c23e/pomufubago.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0b32136f---dokugesa.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/pirutusuji.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096bab52cb35---fekizefitidik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+custom+skin+creator+for+minecraft+mod+apk+premiumPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 17052 bytes
SHA-256: b21682c0de4c5d4ce7886514fbe5d47e3998428237e4aeb20b161398ddbbda09
font_01_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 11060 bytes
SHA-256: 7710db684bb146e201d18b107b232679938169b36bfec8ff83eb6627133bd2ef