Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6eaff6ff3545ee…

MALICIOUS

PDF

74.9 KB Created: 2021-08-01 17:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e3c4e21b4d042d40cfbc63a28e750eb3 SHA-1: f5fc3f0b4120daacc2158f4be69c89e25f8ec94d SHA-256: 4c6eaff6ff3545ee39a8820ad2bbc04ed6d0b31aba164fd603276f1f1dbef33c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=the+binding+of+isaac+rebirth+full+apk+android PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21182a2dd---13877433857.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/43036594132.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/16242689812.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/tebulifu.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ab3c50fdc5475c879e3f50af21741fe0/nadaker.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/79855297346.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ec7a9d852f07304162c17d05e2b037d0/zafizovawir.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c17627da7---madedezitedupojigivi.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/zevuxopud.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d89fdaa8285---fesozuzo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db107e3e5a3---begofijatebipek.pdfIn PDF document text
    • http://jarosi.hu/files/file/dovudanonuzaw.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f2aac54a---pabimitalanu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489f145d78---mejudegiw.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30010031222.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/32914486833.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/18429669681.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d5dstf84qj5tmm5de5oons78hv/lelukimina.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc037576ef---nakatafivimolutedobususo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab3938fd3---2154787376.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/tejotunovukobe.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608da339aa4ce---kidudepatutebili.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/tolupopinajipiwemali.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_off0000c3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E7 11192 bytes
SHA-256: ae998e4a784e21e61345b4c0b0d1f527366800e5baef3af70fe05374ae1a00bb
font_01_sfnt_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 15376 bytes
SHA-256: c6d37a71bfdef7391e3a0475cc940e80d3a7c49fa6a8654d69e9d05f4fd058df
font_02_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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