Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb521108790ee33…

MALICIOUS

PDF

81.7 KB Created: 2021-06-12 12:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3753b6b300e7426d84592b9fcd8d3d7f SHA-1: 069021b7573104e2a39ca3c2ba1340e2f1e94e6d SHA-256: 3fb521108790ee33ec4d81e91d6f55fc270f763aa5f5b90b72dee1803c79a1cf
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites, likely intended to host malicious content or phishing pages. The presence of ClamAV detection and ML classifier flagging strongly indicates malicious intent. The document body's reference to 'Rainbow six siege operators elite skins' appears to be a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=rainbow+six+siege+operators+elite+skins PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d85fad47c---49170288789.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ckvlkd28hmldqcdgijn0gkee1v/fekonoluf.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/nikesirigisemufilozugiw.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dbb66852a---gisiwezofetozok.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a80b0449b6bddaa17e3a0e0ea0df8db3/tekevonolepuwibu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/976b058ec5dfcf048eebc978e7692823/60871336817.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/65638649786.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d4fecf7e71941f6262ef83bb7c51032/9932763817.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c27d1c0db9c---noxoximuzixubusilopej.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/15f459ea9593140b83305b6dc57bfbe0/55171684464.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/tatuzedavigafod.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3590fabd48.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3376661859---tawoket.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ieoh34dglkk5b99r8sv3eq1h4k/zozakozokatoluvutijus.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/jebusunomiratar.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd9049708f---radalonedezupi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ec9466b4---22061711377.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/91c73cc7b8c8a20434a1ea46ef6df996/kegoruninepataloriva.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/86770513184.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 5360 bytes
SHA-256: ac68a5e8093e8267b8b0c923b27604f2dc1f77827e0eb69f904846ac8ff3a964
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 11424 bytes
SHA-256: 896a9bb56eb3b191159c7650b73e35a35d434e3d254b41c3e054729c1ea78b4f