Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35ba143d3fe7405…

MALICIOUS

PDF

88.0 KB Created: 2021-07-26 10:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f4cc34899ac7aedb70077c5ccea91ef SHA-1: eb1e98f5cbc3c8200d3c51557e09629d25182d62 SHA-256: d35ba143d3fe7405317a0b0fa7af49d4511637a32c783a3e2b1cc28ec2a6111f
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting, further supporting its malicious intent. No scripts were extracted, but the structure suggests it's designed to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dca3b55eade49f52551b6a8d5c54f54c/zudubonozoguwobumowizutaw.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac5ae91d6---89001874610.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/fovevisaduvesozetikokufu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t8hi0km5odd11tsomj2fgfes2v/9246070214.pdfIn PDF document text
    • https://btegypt.com/file/pofedefomepaloremofowobi.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/mesupepasusokuxumorixo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b331136647---javoragekuza.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f34f59feeab1abdd6cac74e781e0a37a/91115943074.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/66711129359.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/labunaposomed.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab6594316---letidavowaseliloxopatul.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608109a313e07---904681012.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/q9mnsau3dbv7occf65o7s32a53/duzujefakuwuf.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8de7250b0---tiliwa.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/64485328489.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/32324954279.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4190cc2363---58585646130.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0955203001623896927.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad99bb3ba---88955191110.pdfIn PDF document text
    • https://agatanorek.com/files/file/95538357235.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a351d05bbcce477cebed2909b804c8be/kisemidulibosejemexidome.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f84000ef7---pebomejusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=prisma+visions+tarot+illumination+meaningPDF 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_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 17252 bytes
SHA-256: 240def1b8ddecb44066db05c07b0658af4adeefeb8cc03935447d615d9c850b0
font_01_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 10620 bytes
SHA-256: 0d8c36bdc19ccfee503e7ece26bf25fa1baec710c24f5fb2dc325180b15f141d

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