Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d340b193139c9c…

MALICIOUS

PDF

81.9 KB Created: 2021-10-25 02:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 29b8046247568588549318a0a90cee2a SHA-1: 2d71d3062251b5a213a60c5084dd6c580f4aae94 SHA-256: b0d340b193139c9c23fb5a2f6ee4438a8a9154f8d5ba5b2d6a4498a56e0f7456
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cpviettin.com/upload/files/79979866796.pdf In PDF document text
    • http://0975811252cool.linker.tw/files/golixonaw.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614d32492413c---87684381500.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/48020719490.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3339d68550949408b38d31b3dfe55697/dinabok.pdfIn PDF document text
    • https://aodaixuan.com/app/webroot/upload/image/files/nadazodikafilevupis.pdfIn PDF document text
    • http://bienbao.org/uploads/files/papafulif.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/80811240125.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/rovagaredinowavuvabew.pdfIn PDF document text
    • https://chineseclothingonline.com/File/36080890675.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/86864771252.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202110241652142500.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/36996911132.pdfIn PDF document text
    • http://ewtch.com/upload/files/larodoxal.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/22b3d667675487d9956a4d8b4da62e0b/48180566904.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/80022111607.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/puneweb.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/58124515325.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/63386522064.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/10676093183.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///82712433089.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109121314197271.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/liwasos.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/pibizo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130527f6ef1a---piwefetogitujeperogefomud.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/2I9n2o-U8HI/uplcv?utm_term=smorgasbord+meaning+in+englishPDF 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_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 10812 bytes
SHA-256: f0dd00b267306722623b8961056a01dc535023f279e6a19f49eddcac79c69578
font_01_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 20292 bytes
SHA-256: 2e16f9b986d7536cfa1227ca278e4e8b1ea63e58cca9412fc405d1e9ef980761
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1