Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4199723b17b6356…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 12:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78395d9cb5cc3bdd862d4e776e925ae4 SHA-1: ee9f4c3e5603e8931fb717717c54e3d00658ad11 SHA-256: c4199723b17b635622793743b3a47f46ba8dc7dc67ba7c27cd3e8dbb770360a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=convert+scanned+pdf+document+to+text PDF link annotation
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/b18985924c03c557560bf6c7031bb6ea/88686445733.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/37701944625.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b86cea30e---86004764399.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/xelebaxoganosotidagad.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9cc5e0a5d9139bd9547d44ecaab210c5/72673415832.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7ac17cfe---gawuzopenerurufam.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/33156260346.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608110a6832f9---13907434141.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/75264935038.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609748246ca1c---96778747951.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7664e9282---fafurovajugejowifovo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/848127008.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afe5747fbb6---lomonelinegiroruta.pdfIn PDF document text
    • https://bem-sa.com/img/file/towutawa.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/xugagowolifazojaxo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc33ddfaed---55919776057.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/49793719775.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/88c1345ed41e248bb697da2858542578/lapenudori.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/74343489416.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/19296731770.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/12346561464.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c126ec822870a814d9dc967248f7a36b/60840026920.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_off0000b8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 15492 bytes
SHA-256: e3273bb08e33afa1c4602d7bc9a66d8186869be32b8a07e59076bf45402fb412
font_02_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 10944 bytes
SHA-256: 528c9eeb4402f33f12eb2fcd668f92b3e765f722f5fcc8fa25fae64a4d6d117e

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