Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e28f910dd14369…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 09:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dbd1d0a1793c1f8ef7dfa845c9b76ee SHA-1: 0bc2d717ae46fbc1dfe4684a4a9d1f3cd0c8954c SHA-256: c9e28f910dd14369a97cc06497dd17667023715ba9ba27d3bbd68fc4fdbd6887
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pixomot.ru/uplcv?utm_term=modifier+photo+pdf+en+jpg PDF link annotation
    • https://beeshark.ro/app/webroot/files/userfiles/files/duvater.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb09887c88---74906697768.pdfIn PDF document text
    • http://honghuibio.com/d/files/31672515563.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/mazoxisenuzujenofan.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/jixivufifugadij.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/231e69f4aefac5d7b5d4f71a598e5dac/nigiwavuxinezu.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa05565304c---82190721822.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c6179deccfa---79167200816.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078714abe37---wefitopovapadetafawoje.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9em1hjdriiv0jmvh3h84qt6c32/sekaranip.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c36b86691c24b265432c4bba5d0b110a/tevebilabitakesofed.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/kiwopofe.pdfIn PDF document text
    • http://getvisa.ru/images/File/9887138933.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb71d04b1---96044321538.pdfIn PDF document text
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/zebexasupelix.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/gafexewogujanonilo.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/ropul.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/mowukesufenakofo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ecc2526c6337374870baeceafe1bac09/fixigatifubuf.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29774669121.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160efd4a9cc9c9---92059994694.pdfIn 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://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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 18296 bytes
SHA-256: d02929ab77f157d0a6b80345f91b23573f490b6bc3c66d1e208895afea78e849
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 10524 bytes
SHA-256: cf69e79e4bfde7882398d986162d99f9647503f7fd1a058bf179357dc6bc4c47
font_02_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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