Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17da8f8a8fcc5ef…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 04:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a095d86ca476c12983868a2388d973f3 SHA-1: 201de60111526ff726b54b392d2603e2df3ca04a SHA-256: c17da8f8a8fcc5efcbeef4015d55ca8c207af7c28657e8f192f2e074e69895e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL heuristics point to a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://dogathermalhotel.com/resimler/files/91514492437.pdf In PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160961acd26d37---61738715657.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/56607070611.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/79313512474.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082365b9ef5f---gevodasomamakute.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/jobugabupekawuxoxul.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/xefes.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/60296614624.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/92929899401.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14ce78439---11500455874.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/buxivolezop.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/96863584842.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/sefaw.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608744fcccc60---93844393455.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0a8cbe4ed5b9209bd5873464b5feac23/38543562072.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/kiavtoc0cmnj9o74dbe1os74qq/138247306.pdfIn PDF document text
    • http://sparkpro.lv/content/file/gamiwitax.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/ruzoraba.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4f427b8dd3b0cc0db39409f1ce731b65/58566297929.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/ligewofaposogofabugixewa.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/upc2adsrge31pftgr203h9i7tm/gujofesakalorawuwazebovul.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/32445630554.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7b7d0878600ab4be13d1d7a64319b519/37553058912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=business+administration+nvq+level+3+answersPDF 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_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 17776 bytes
SHA-256: 2c9e9712bb8fb0b285a2eaee872dd0904467772b12e12e2a76887fd94f4e7dad
font_01_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 11032 bytes
SHA-256: ef0a1b2d26654c3ce804a2872273d7349f54cce682cc5a47cb4c93739a9efe02
font_02_sfnt_off00013963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1