Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffae0ba9a796ca5b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 05:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2edfafb623ffb23d42aa024906e399e6 SHA-1: 2b25166fa5d8188cd60baf4c1dbb4b1a04a3d8e6 SHA-256: ffae0ba9a796ca5ba4f7eb6f52cb00c8c29aa713da100aa6859e6a374add03bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/33c7adc5f88ce73d5537530b5fc741c6/13803167598.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/la230ejoa34j31ridomalmavf2/ritupeweseguxobetedota.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/32060603423.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/10e923a34e0bb80aab72f3628f21b017/5421580875.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3f7b9017f---lijakazukomuf.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0fa931e6---92571466551.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/776c995bd444a7bd270c95d2da607027/karexela.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/55498805548.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26df84cf21---tetemajomob.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb0d8bfd53---69031764941.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/6mifh7m9hmuk03dd4fktlo9o4j/wisegepametulurosi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/86153747111.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/23442266620.pdfIn PDF document text
    • http://zubrcup.by/files/files/guvalisole.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/46371522594.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/vewevubufolapumanopajon.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/33237516686.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c79bdd342f7---75923331327.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/75754869057.pdfIn PDF document text
    • https://kar360.com/resimler/files/82096880572.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/desimaxobejunozegef.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40c35aa7af---33897557416.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/bonebu.pdfIn PDF document text
    • http://coffee33.ru/archive/file/belebunanad.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/rikinipetefivupezesoluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=trombly+terapia+ocupacional+pdfPDF link annotation
    • 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_off0000bddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 10928 bytes
SHA-256: 86efcdf980c35767bc932b93eba900977426885518f9a2174a66bd8d232ac828
font_02_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16620 bytes
SHA-256: 806bf6b8907dfde18e599023330b2a3d5fe42b735da3a96c777777c042f3de3b

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