Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdf9a9990607830…

MALICIOUS

PDF

98.8 KB Created: 2021-06-12 02:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d6bae2621e91fa1a7a0ef57e9fe46dd2 SHA-1: 94c2b5732394e3c8ee00872253e6edddbcb65ce5 SHA-256: dbdf9a9990607830c2710ee6ae48f4178f0c9770ac88d3996ed91dab4481f367
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

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://wastran.ru/uplcv?utm_term=twilight+princess+gc+iso+jpn PDF link annotation
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608075929122b---dojusekajozanomupigili.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607699b9cc22a---56619299818.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84bf71c8a---lomenozutokoxinodaf.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6a9b1a259c1d51a06cfe02aa3142ce1a/32938093850.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b0a80989658943f9a4f47f55080a92ea/vunaru.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/29801914650.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c189a7392---naradirati.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/47142953557.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hqnaqv45ieqooss8uk1fqvpc9m/kesexenixanujenatiliw.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c334b05bb---95806614172.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/890d34d3dfaf8e8eee3d3c523b7e8f83/77605666656.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099944fdc303---97694925877.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0344074e7---wolatexodimepevi.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/midupoxasejexa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/77086353825.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/jotekexefevawopesojet.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ced1fb56adc24ca0ace0b9c0bc139c3a/52973855163.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 8144 bytes
SHA-256: 455e706d5bb1638bd5e4f426c9f8010a2393c8fe2a7d87a454bea975fa8d96d5
font_01_sfnt_off000140a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A8 5100 bytes
SHA-256: f465afc452ceea3c56449b33c7a75024697231c9804927c068b137853817a20e
font_02_sfnt_off0001521f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521F 13012 bytes
SHA-256: 50624f525c3a3d77d11560ab24ff69f7e910631bacba21a5cfc556f27b58459e