Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7eb2fcf07fa1375…

MALICIOUS

PDF

93.8 KB Created: 2021-09-09 13:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fbf30ddd50bc97c380f89d58df07fc7 SHA-1: c394cff33888d10202062c15bdc15d6f62265938 SHA-256: c7eb2fcf07fa1375c1f1a0063411994c614a8aa654a96923442946f54c6dfa9f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://amongelite.com/ci/userfiles/files/19281170025.pdf In PDF document text
    • http://oilspecchem.com/files/18221894421.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/watemulak.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/sewitekudanoviniwa.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/55719359280.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/66188726904.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/39f76536695f112c597e29d76f432137/bamilomotu.pdfIn PDF document text
    • https://robodom.si/files_vsebine/fojovedezosew.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/85f3cbb62a16207c7955b99f8652ed45/17100791685.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/44e031cab13e5fec6516cd7a1f327268/72371687664.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/27765180476.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/19795768078.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/mikanatonof.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/zikose.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/2360848919.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/kunudidomubokukotenevegi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/12e58adfbb5a5e3a467646274e11d4d7/40405812890.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/18235793735.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/83190880486.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/tususa.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/52660910855.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/zefupewulim.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3c4f06d4---govipez.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/22871470920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=warhammer+quest+android+reviewPDF 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_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 18780 bytes
SHA-256: c936d793321c9996ae650713595359ded50e3839c0a0ece03ea2878716bacfd2
font_01_sfnt_off000138c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C0 10860 bytes
SHA-256: 0bd33a71502bb14f30cb181c1bbf1959ecb4f388caf4a61483bec7106a698c9a
font_02_sfnt_off00015187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1