Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1ef6c5aad536e9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 20:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e364edeca28e60904d249770adb9794 SHA-1: 23ea6c70217216bdad9022b4fcd34405d231088a SHA-256: 6f1ef6c5aad536e94acdb36338f97e63fd26a3627641cfb28b4218fa03cad47e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=makalah+asuhan+keperawatan+retardasi+mental+pdf PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6f9a98f469ab53f86a19f8dba9a7e329/88503674210.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9e3c5535d---bolejuwivifiba.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/zewepunavodemiwuro.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/40105188524.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/mibagu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cf3ddf1c9e977e14076f5148fcfb82f9/xofemijobiboguraj.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b475299400f---dinuxuxusunutodorar.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/19895184960.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vizakotusajane.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/45185812417.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e933aa18---54229242565.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2416c0c52---zawanodigik.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/fumijobenivosajed.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/52402988260.pdfIn PDF document text
    • http://candientuvibra.com/images/file/zurigatovit.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21817199882.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/73377054886.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/601ea3a7b7fb0d7517c51a39979833a5/naluj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fi5vvukes05liieh5b38m9ega3/nizuj.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083621d9ba43---73212297234.pdfIn PDF document text
    • https://wecareprogram.org/images/file/riroferizixek.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/62486350895.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b721594c16---kamuzopoz.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/17369366968.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f76cf1b23e6d845963c46dae9da4a005/52330310038.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/94996762999.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_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 17532 bytes
SHA-256: 51865fae3c902d862e29bdac8a9efffc46dcdd530334c2dfb6cd3fbc68df4458
font_01_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 10912 bytes
SHA-256: eeaf6907e7ec4ea4d873e7765a228577df06208ac494504f271e42d84669ac22
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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