Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a6040a9a0d9a04…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 00:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62b5b1ca9d63b9c16031cebb513605e3 SHA-1: a4878f1b3dc4e714d71e5844818498ff95eec892 SHA-256: 29a6040a9a0d9a04ccb98c1d098e4f0c3753be34ee63e5dc8e8cdbcdf7a7c1be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ketchas.ru/uplcv?utm_term=cool+math+games+b+cubed PDF link annotation
    • http://baikalspring.ru/ckfinder/userfiles/files/dovozizevimokoxo.pdfIn PDF document text
    • http://websitesample.in/atlantis/assets/ckfinder/userfiles/files/59925306498.pdfIn PDF document text
    • http://tcihk.com/userfiles/gisexos.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/lufew.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/22599050207.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/zirusoxu.pdfIn PDF document text
    • https://mollis.rs/files/87549108477.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ed69c609f---86967968264.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/32483859497.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30788a6d9---31238305825.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/sozebasokawoliroxo.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/78993227875.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/vupafodizonabu.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/fosekumodiba.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/kajiwemixofebedo.pdfIn PDF document text
    • http://minhanh.com/files/27517235391.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/zorawodelusiladuvumopasad.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/taxutonodesakikawajumenaz.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/48847216972.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378900e2e27---jakuforonewarir.pdfIn PDF document text
    • https://gameclub.by/uploads/files/61042858219.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/96462511872.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/datidazagarinetedupibuxa.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/7140625460.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/nebirazezuzovom.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/rewamavo.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_off0000b55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 10792 bytes
SHA-256: d510003ea92cce23643cf8fa756ef633ee5cf98e71f75eb8db875825d7c11786
font_02_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 16324 bytes
SHA-256: 9a819e7a55e3a465234e938d563cf6b05cab56c908fcead5eaf50df85b073836

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