Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83485f21749d634…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 07:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c02bc0aef8f5b3f97f95e5a4fa1f5537 SHA-1: e4909b42def635876c86b8607905df1c263f90b3 SHA-256: c83485f21749d63435bdb03b01422af2194723d877fdb557448582f418ee6deb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination or evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mb-classic-service.de/userfiles/file/vunuvo.pdf In PDF document text
    • http://galaxyjewel.cn/uploadfile/files/23502527622.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/824af69baa0feaad3662207d65ec6093/67986677658.pdfIn PDF document text
    • http://toroisg.com/public/images/files/vimorowato.pdfIn PDF document text
    • http://lactopad.com/uploads/files/85487480145.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/lorazomop.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/darajumanakat.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/dojifugokotom.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/99812025639.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/97375997866.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/rerabifezamesudedubi.pdfIn PDF document text
    • http://stefani.cz/fck/file/68916135492.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/991198fba02b66da83c9b7bbeaa0e2d6/2286410046.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59b8e3a80---nukuwavenewolopu.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/babonegalogupar.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/16eb7faee5082958aa2028395cb98a3a/zijimipu.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/kegomagowigifadigefuliv.pdfIn PDF document text
    • http://school15-tyumen.ru/f/mukodesamirugew.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090805272973499.pdfIn PDF document text
    • http://gardatrans.com/content/Files/xavazalanoziredavuf.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zefobaxafevevu.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/xaxuxajuzobazivizelupav.pdfIn PDF document text
    • https://taperagi.com/contents/files/makarigowodafamolefewezon.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/bezemanimepitijuz.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gowamewogesosawawik.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/fipesajefakigejoriwufeja.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_C22215CD33E9D566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+game+play+store+2020PDF 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_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 17120 bytes
SHA-256: c8b10e15d3e651e1b8b51096c574e8d670ff0087f150fb4d0e740a1fa442d1b3
font_01_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 10808 bytes
SHA-256: 2afd956091ef3c79c0805d1773b048ffb6fcf3228b64d6b07474afbe7696d408
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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