Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3e08b1bf236628…

MALICIOUS

PDF

107.2 KB Created: 2021-09-11 23:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e0a842f6a61c41f31201fe75ea169ae SHA-1: b96158169826bdc0151ff678be8cbdcc9ab33fa0 SHA-256: ba3e08b1bf236628c46891bbf5607883a8c73ab672e74e2e3548ee32ab2069e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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 http://denkobarbell.com/_upload/files/2876522860.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f70a870d---jonux.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/todevotasabu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/21969039663.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/67007760271.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/61580520555.pdfIn PDF document text
    • https://cargobull.cz/res/file/kunod.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/53340357893.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/13430478604.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161368261222a6---gagesuk.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/9247934128.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/newiwofagi.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/46083696742.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161361ded2a24c---71357451353.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/22860753846.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/35448832112.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/99136022053.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/81472431840.pdfIn PDF document text
    • http://bienbao.net/uploads/files/wefim.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7gq9uu6dgiourkjlauqn8mep9n/komuvugazajunapivetom.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/zuxef.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/besugeloxowujivekodepi.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/pikarudowukonadoxa.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/41931387434.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/2622856986.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/tidifezogalikizanuzusaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tournament+server+ml+apkPDF 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_off000139b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 20372 bytes
SHA-256: cb76adcc24be007cf0f3aabfa37987cbc8ad1fd4361a63cae3ec139da0798c73
font_01_sfnt_off00016ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EBB 10544 bytes
SHA-256: ff28a43a09150ec9e63b2547655ef0d6cbd303395f30ea93f8912d7e7bf8f42b
font_02_sfnt_off000186d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1