Malicious PDF — malware analysis report

Static analysis result for SHA-256 b421285d9423abf5…

MALICIOUS

PDF

72.6 KB Created: 2021-06-19 11:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81173dcb9ac236eff1aeda99079b968f SHA-1: 5e03ff157a7c6c1b0530a52481ea3e20d5fc4f8f SHA-256: b421285d9423abf5e518ff8e7ae3be6f0adf08065616b9b4aca300c85034547b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dd302f2482405bf39b505e5da929ed94/78226039803.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/980cd37d2828d0056c1c6cffb6d1f318/34049843675.pdf
    • http://nadiadsa.org/userfiles/file/52228145989.pdf
    • https://nexusmediation.nl/files/88694632734.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d83fcec8856b86f54cf7599ffed817f1/52029990829.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63bad51bb1---64527173887.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec6719179---ruregeziso.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e91cd24b---gidomexefipakimi.pdf
    • http://n-production.com/upload/fckeditor/file/6531688056.pdf
    • http://www.nomorcantikjoss.com/file/vobixireledimawalorogid.pdf
    • https://inijariku.com/ckfinder/userfiles/files/5342652087.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b955ec21c31---63034666837.pdf
    • http://digitalpolicycouncil.com/imagenes/file/kapulivunumepejutaxo.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7a8515c6---17789446700.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bootable+os+x+installer
    • http://www.imgburn.com/index
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5c.bin
bc3a87814e12fb87f3b8c128c84c801b84b2524522e6a660a5b25a80ed600777		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 4936 bytes
font_01_sfnt_off0000f030.bin
240dc1f8e68246be791ccbaecc4c90a7c71b2204b557aaa45ab1f0eba2f85039		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 11096 bytes

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