Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8282ba18d11370…

MALICIOUS

PDF

83.7 KB Created: 2021-07-20 16:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5b74546e24d1bcaa39a4da853737253 SHA-1: 1e8eadb32c012f63f6b28310d9640e1a704eabff SHA-256: 2f8282ba18d1137053b1098b59d790fdc67732ffd2defcaae96b259fc7671bad
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://volamtuyetthe.com/userfiles/file/27854257160.pdf In PDF document text
    • http://agendaalzheimer.org/files/galeria/files/bawufuguniwefatavufipipu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f2115719fa0aa50683d26a1a675f0b79/33239038014.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xenuvedo.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/22523235019.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d3da75f53f2042fab238960c53f225e2/7923838637.pdfIn PDF document text
    • http://lucann.com/Upload/file/54516200577.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b50b9b13bdf---54706481056.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/basigasuruzaxan.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098363e48079---pigopawotonugimitusejar.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e86d820dfd629cb77b7dc2c376ac8134/gozasewewamuvejiwejepem.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/59cb5grd1f52v4mqvklpoqff83/24181112390.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/7883724591.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cde10b477d8---23008658629.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/sinuduxizodezumovolos.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/takejolefitadigozewe.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f36b3e2f47b---25469362376.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078222842d89---topijajanevodubanexab.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/91e43420d1121a0656858b01e8054dc7/bozosivox.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/dcg6p39ui7a905oejptlv7lrdv/14833858874.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/45905051723.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d804ac91e---tatutufipakutajawox.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/3512497561.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b143b971c9b---81100812303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=where+are+the+toilets+in+spanishPDF 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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 10344 bytes
SHA-256: f322bc4ec81a20fd28a7570fca060a9005ea30c4e05534a878f354c9599409ff
font_01_sfnt_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 17452 bytes
SHA-256: 6cde427f0a67aae8cb40c60705111aa0ddb6d9334418ab61febd6a480b6ae9c3
font_02_sfnt_off00012a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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