Malicious PDF — malware analysis report

Static analysis result for SHA-256 022daf5ca23947a3…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 11:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d642b1def069dc520861c418893e152 SHA-1: 6f53c3616733f7e15472bc673500836c7b169eed SHA-256: 022daf5ca23947a3331cac665749a784899efd2bb1973e6bda47fbe18b7132fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on external redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=2014+kawasaki+mule+4010+service+manual PDF link annotation
    • https://nergizleryapi.com/image/files/zakudizuz.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nuvukedizavopuzegosilo.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/41093513357.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/lomanojesepesuzop.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/74787305147.pdfIn PDF document text
    • https://adikketiga.com/contents//files/95386906151.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27bc9d3df7---fakob.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ce6abb97c1a1df3e00cd48079d391284/51105330096.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/110426166685.pdfIn PDF document text
    • https://viettrungson.com/media//Files/zonibodunelisovamumut.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079803729ce0---kodagadoninakepiduwen.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pukedufikigorimamawikuk.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/87319933303.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/fularuzugowexapazos.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/48834a6405286d36c71bb8475caca27e/21839793142.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/214726420cd0a731484a58384815d204/46074019357.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zejuzudelipe.pdfIn PDF document text
    • http://chemicalengineers.ie/images/7040490355.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/wopegizuva.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/92019481297.pdfIn PDF document text
    • http://jingtianlawfirm.com/images/uploadfile/files/gurejam.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/46265083225.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/03789bea553d391ded9070ce08d0a28d/24492932515.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082adf817b1c---wetipumajem.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_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 17128 bytes
SHA-256: 0fd17c4df89b361ee40df28b244a5d271567d7ac8eccabe364788202abd09edf
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 10792 bytes
SHA-256: 368b1908d197243c442d04958076f4f4da0a3dcb6e23536361787bbdc1ac548d
font_02_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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