Malicious PDF — malware analysis report

Static analysis result for SHA-256 494ad611fbcfd1d0…

MALICIOUS

PDF

79.1 KB Created: 2021-08-29 17:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46c220f04716b31a901d4bdf982634b8 SHA-1: e3f7b0ec07402ce23a1c8fdcd740dfd5b2043565 SHA-256: 494ad611fbcfd1d02af6e6a9ea5a645be26823f7486287753da0911362c0bbdf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=first+moment+of+hand+hygiene PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c779f87581---36054347214.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/40681896974.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/62697958095.pdfIn PDF document text
    • http://ahchala.com/img/file/fasafazonure.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16082e46aa8d03---rinesis.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160769f694b45b---kegigo.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/vesapidisexoxowo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f1b4624ad---15538934059.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/40985830723.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/49727424222.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/retavukuvurufizokule.pdfIn PDF document text
    • http://trubaopt.ru/content/file/40196818299.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ae5pa8fkmpcrqhtef5lo6hlee5/86533553729.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ca783d0c---87065517272.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/9ec0e1a9655ee7ad47cd80b545cd52f8/netomunewawegejukimuluno.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nn6j00hien9ku80eddtd6gq4b7/83031952012.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/vumazuwed.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/2634650392.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3ec4c536---35077705540.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/98073282794.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/56309031208.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/medeziragolurepaj.pdfIn PDF document text
    • https://brod-plovdiv.com/images/36506459140.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095fba02f7d5---pavagitujubavidebugifakas.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/zaxebedokimeno.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7d5b76e54---xisizorobenaxubu.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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 17200 bytes
SHA-256: 0623654fbe9db77c65b0f1e4b5c71a14a000a7bf588a436d957b3165fed4ca1b
font_02_sfnt_off0001169d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 10844 bytes
SHA-256: 977036bbef891268e11b838e25cc6ab140fdd7bb43dd6b880885c2a13b2549b8

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