Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e4360c65dad65c…

MALICIOUS

PDF

75.8 KB Created: 2021-08-30 09:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3e1dae80817d930fda593ad4d6b17af2 SHA-1: bc054ce74270178cb99502c40512d5337a8eaa97 SHA-256: f6e4360c65dad65c54a98716814c4dea2bf14dadedd0434734c02bd772dcae7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=cheers+and+frasier PDF link annotation
    • https://tedvandergulik.nl/userimages/file/fubiro.pdfIn PDF document text
    • http://tms-operation.com/upload/files/18838990448.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/divr966k8vobnu841b39neeu80/73480529018.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/xorolopomusofijesosegodi.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/35724763543.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0551cc3597---50858003231.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5c3a769ea12a4bc043c4e05fbd33b647/vusedulevamuke.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82d81a24e3---nagosoboxabosame.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/48644067083.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/kizipanetelarurev.pdfIn PDF document text
    • https://oversaslogistica.it/file/nakowulajitasene.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/85727307455.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/begoliguresiva.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d53cad29400d0f09aa64471c1ec9816e/84595264801.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fojajimemeramowaliwad.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be314c6636---86715936867.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/11039657039.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/sibomalusedakagim.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/tq8t5hgoe4ps5qhgf60mjabit7/87171778280.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/sozekaxuwusigivuwo.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/nubevowuju.pdfIn PDF document text
    • https://bem-sa.com/img/file/ranusurikilupelo.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/liwefim.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_off0000c418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC418 18304 bytes
SHA-256: 5b60587614413677f6a40f8436fcafbc5a7b8dca66e1ea4087fdb4b467824083
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10220 bytes
SHA-256: 4a7f90264c6d5858062fed987346af131422176fd35938515c09b15d47485244

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