Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d67489873dd6831…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 21:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b475b032febbc8d713f7bff3f660b82f SHA-1: 717c90d22d8c760d1db525358964d45d85e01795 SHA-256: 9d67489873dd6831501f13eca162dc6fd5984ebd8914a58d545d8b22f93060b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be directing users to potentially malicious external sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://szakkepzosiklos.hu/upload/file/tisumigubadexalovakan.pdf In PDF document text
    • https://tdfstore.it/file/90802836694.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b127b0c7---80114149008.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160748b3965911---72023271709.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/94380643669.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9a2699d5992c96108c455994dfff99d3/pefizuveropazobesikef.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/zejazogibipawu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5681cea1---zasafutasuza.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/eee6b91da0624ade1973bfbe7048707d/lojak.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959e3270a46---fojinej.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/17171573231.pdfIn PDF document text
    • https://actor-conseil.com/files/file/50960258981.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/11422116341.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/33753581367.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/36803491800.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d99a65f5804facf02e0d7b3cbcb318cb/vuxozapinitusebewopa.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/sokivevewapasigatata.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e8e686ca9bc6092f8c122980ea693130/wazamubofuluxeverajolesez.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/veludolukabuzu.pdfIn PDF document text
    • http://hongdacable.com/d/files/jegiliwinefobalobopowojat.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/motiv.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/f9dh1qplje8fslonrbnq8idt1i/77903173752.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/lizopowinaxumixone.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9skm85fb3sutuni42njmi9c6ja/69073443291.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/jiwozenuzonafoxovaf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qaf65snngku1vig6okp9qtqnc3/39392836924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=plant+animal+cells+worksheetPDF 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_off0000bd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 10672 bytes
SHA-256: 2a96047c6170c4e477d059365c13eebf5f9dd95a64ff3c439df94a6f3021999e
font_02_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 14672 bytes
SHA-256: 96675f1115470b46e63197156dee69174dd58ef4ff362cbf9d8338a6bb1dbcd5

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