Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72b119dccf3c869…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 03:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ab5ae8bbd1a9573bfdeee17f8a81564 SHA-1: 8c919f28e6f346f367a345abbccfad1be40c0757 SHA-256: a72b119dccf3c86919dbc5c241f344a0b86308f30c3632373232ec7947b5f05a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a87fa07b9b9---tuxukosuwilimasome.pdf In PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/76030258282.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/wudutijavemilefunizijo.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/86319792322.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/volekewoxokovi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3057221d42---89337439730.pdfIn PDF document text
    • http://esteel.my/userfiles/file/wikibi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607690c14d96e---kagegose.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/13435761495.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/60092505298.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xebukusopowabekumokisilum.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/xokakubunetatosowavej.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0c06e9c47---lamikimajimovezeroz.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/kodaparamibejize.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/geganewagedajusizomon.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fabakikuxo.pdfIn PDF document text
    • http://djpress.pl/Image/files/ziwidud.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/fowokaralusagupeji.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e855243374---kugomibosu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b53321e7d0f---voxuna.pdfIn PDF document text
    • http://adveotec.com/img/file/14905319934.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161010a6ce1a97---83360770470.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e8a7ac4e---vivazelajupilidaxu.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/138533825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=citation+and+referencing+in+academic+writing+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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 10864 bytes
SHA-256: 49d5b80f8099e30b3d30d4acaa006d02676d7f6767d85104354ffe9e1b976a76
font_01_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 17812 bytes
SHA-256: 9c2ef50ac98f983bf57db588ea8335bf4ef66e6462afb803c8a5694bbf9325a0
font_02_sfnt_off00012395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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