Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2929933c6c8571…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 10:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd2c65545da1c36d8a8ad7eac21aa6cc SHA-1: 71e2e987f47dcd1e4e5ea0db7e4b8bde59bb3378 SHA-256: 8d2929933c6c8571bfe0af1b6fa8db558ae6ad9131032c4dd568696bfaf777e3
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=finding+area+and+perimeter+of+rectangles+worksheets PDF link annotation
    • http://imdad-egypt.com/userfiles/file/rapezonirubirebod.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e4cfbc0a574eec0433fea8ee42af5a9a/28000243642.pdfIn PDF document text
    • http://beiks.info/public/file/tidurera.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/403271622.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a346fc39a32---paruxevirajarunokebabo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/geh4po1a9pdpcslr9q9feeo6r5/44256179527.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9218517858b7bf06e2e53e8f78041c95/bukapibosirufo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaab65cd4b---zezoxolu.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/popudinowolomugizil.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/jusuvasarekudorepake.pdfIn PDF document text
    • http://schokobrunnen.com/idata/90094295288.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/mubuxe.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/wikokorapivinegokib.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/76707984694.pdfIn PDF document text
    • http://roocenter.ru/upload/file/33233414054.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7a5162bb3---tosud.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b3a6467831d3a183b1bc028f8cbc9328/girigiwiloni.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113395635653---pobamiruganufefasuk.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/xikofebu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/fufiwow.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160acee8389535---lodobuvivisu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kibuk.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_off0000d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 18336 bytes
SHA-256: fac006978b9d294314f8f2686a82e0faa99663a8d4d27caf31d5b0d04af95f8c
font_01_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 11220 bytes
SHA-256: 6288bc5f06d60133b2020efdc65243058eba29eebfef8a8af2b784090a326426

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