Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa99d936bf7409b…

MALICIOUS

PDF

86.8 KB Created: 2021-10-04 18:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 306a24fdee715bf9c9011f355930fc9a SHA-1: 9dd28e28d5cc3afdeb77dd8a08d8152ed5148c76 SHA-256: 5aa99d936bf7409b5d0b7e98f0e4071a70b02cf826f0d912dfe0d3e6a4d92e47
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ghalemdi.com/userfiles/file/94970660587.pdf In PDF document text
    • https://glaskunstcentrum.nl/images/file/96013768688.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/puwolarafowovolopezaxa.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/telekowapunavudexebosup.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/77143093803.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/69332417331.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/xuxekodiseduvuxaxiji.pdfIn PDF document text
    • http://cichanski.com/Upload/file/27416087888.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/56597278954.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7dd4ad2540cf6fa6c432f9cd4dd74f55/divefamuwilemosot.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/71057958beb234e8e0b29bb5df56fe2e/jewazutofaxomo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156b869bbed0---zatutaxebus.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/86776157140.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/6689284985.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/fizawipebeti.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3270f5118c1e59fa117cc43345f8705b/29536346488.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090108001173499.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vezaniwilejebagepa.pdfIn PDF document text
    • https://ccskin.com/geektic/files/63826256344.pdfIn PDF document text
    • http://erdbau-rauch.at/91283992438.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/zaruluduzagadusewete.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/39807318280.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7adc99e58---51361764353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=walking+with+dinosaurs+remakePDF 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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 10964 bytes
SHA-256: 5d1f8981618e7baaec8745862f02fe73a05ca4f3a24432be89ce2654ac8ac82e
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 20312 bytes
SHA-256: 8c63e216d0aa68a7f52b62b0f69ae8818f7020599c8053c5533576741db9df06
font_02_sfnt_off000135f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1