Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8db06279bca112b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 17:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f3b5d76abb148f48d59c30191545615 SHA-1: 3949eae67c22edd22be2bd43bcb90b0ce9b039d2 SHA-256: d8db06279bca112bf56b3e199a6f65ef651e4eb70f69b796f4b70c96ad414073
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=caracteristicas+organolepticas+del+maiz+pdf PDF link annotation
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/967cf1aab9a70da157238564b27753a0/fotizoromokuvedek.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/lodidelupul.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1a21123e---70060071998.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/kevop.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/muruxinudegedajusos.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090175261fd4---lokoxolodim.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rk7p1f23fsf97f2gm2o8cvpofj/29127276597.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/da66bfda6dfe6ee2fa8f09e3580c8c7e/19770622317.pdfIn PDF document text
    • http://ausafe.net/images/art/files/41185733616.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/22437653803.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6be6bbd8a---69926495083.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b95ee61409985d2bdf006dfca371514f/18111033618.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7618d021---vaxedivozisufipuz.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffc318d2d---66763150274.pdfIn PDF document text
    • https://stopserv.ru/files/file/ruginomuxopek.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/4236091523.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ed0133bf---difedisobada.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/kupekirejepowopawogo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-28/20210528092042171597.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/oadd03qkq8mgq7rjedsjjpbrq0/pomawutojokatagunadig.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bbd594cd72282b15625e1272af56c32e/barugidipijuto.pdfIn PDF document text
    • https://egca.fr/userfiles/file/49695839364.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4a1f2eeb---pubaje.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/79549554292.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/8f1c1038c41340eee3c8a5646372fa35/73360668240.pdfIn PDF document text
    • http://iphysiology.ru/upload/89612258932.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_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 17932 bytes
SHA-256: 7d5f3e32c787ba4d2ff4ef09662724583e5ef276f6e36327bcc0f3e3bdb1bd65
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 11052 bytes
SHA-256: 7c9a848c8c4e0ded148c9571f7771f2852390ef86e3bed8f2db4581a0bb1963b
font_02_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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