Malicious PDF — malware analysis report

Static analysis result for SHA-256 23801e4c8cac1c5a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 03:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f68ccb600c3990b2ce921daced6fd5e SHA-1: 9c150e1b79026974b8d177581eb0b195d91b5c63 SHA-256: 23801e4c8cac1c5ad7afa713f8f1171c6eebf34e1760f9220341098c8a7879bd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farm characteristics strongly suggests this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://megatex-plast.ru/pub/file/fubutopijuvarefoz.pdf In PDF document text
    • http://brainbond.ro/userfiles/file/gobizelufimuravoxusaxiwi.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b02a5288ba97e10205d30da214f24a98/tevixagogunowit.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/46285678253.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/3c046fc33b9a71955c0128fec2e3e65e/pofimuwomapugoxoxefeteni.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dufer.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/daxanekatifemotaru.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/82621714397.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/87584255495.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/23561190891.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/wugimukabafamuxopux.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/pinofakiladoweti.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wudisalakekotirinasat.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/dfea7c5de3ee828de771040803249658/mexuxodelomutoderevaniji.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac283b9da0---81915489705.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/9901219681.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6719612bea570bfd316518412fdca48d/58644493592.pdfIn PDF document text
    • http://tochalco.com/uploads/files/wogikevenoz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9g6rmnijo1prtft5e1i9er13lu/jesadikanutaxov.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/fezimiw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fr5hu8rfs48f48ld163khnsq60/50787172266.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/liknnspvuipjlave7t38p07ti2/23579276010.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/72944993610.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f5d23c26---nexamosewunipulutexipoza.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/58122680957.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e26af452d67---48780815766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=he+will+succeedPDF 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_off0000bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 9956 bytes
SHA-256: 8a9514a172c7efeaaeb93ed9e39a3583a520bdc13c72a9dfaa51277cb2bd508d
font_01_sfnt_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 15204 bytes
SHA-256: 11f8597d144d20caba21af080125a3fe3029d8fc5adcb68cc49c761e18f911f9
font_02_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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