Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e43bed7eead8cf…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 06:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 484edf074a50ea2a9297174549f5906d SHA-1: e4cd802695149b9067a0e78b332fc5f28b4b8ca4 SHA-256: b3e43bed7eead8cfd9657721bb74f0d09599e40cfdbb861d62f1874758c404f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The primary function appears to be redirecting users through a network of links, potentially to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketoanantamhcm.com/uploads/files/45334919235.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/68bfbb29ef8d6476ce3dd3abbe780b74/57943546155.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6cf6f875---lonobudufupoxe.pdfIn PDF document text
    • http://info56.ru/userfiles/file/1560701432.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/gawokotujo.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/nikugezirelimirebe.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/poligizutovukez.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/kiwumugovaxidijeno.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e725ac79f5d8b63485023d8266bc1941/luvefumofojojozak.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4e2468f685c9b0f5433a0019e3cc7fc8/xotezewotekukilaminiv.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e43895cb8c3---teruraf.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/zidilumubikuvolidonoxo.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/zatadanilomimi.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/zudatomafodu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a3267167381dab86e6c3d82f9e96c82b/dezigutuxuzobamobi.pdfIn PDF document text
    • https://xigmatek.com/upload/files/63592868555.pdfIn PDF document text
    • http://rld-carbon.ru/file/nusufetazaxiv.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de999fe13---48292902527.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/togajivavalu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e7c32c71ed9db76390d76c7b72074a19/43810266002.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a04fa008e95---tekusobunutukone.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/17723110388.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/48187196005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=plantas+curativas+mexicanas+pdfPDF 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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10928 bytes
SHA-256: 0de5a152ba6b752e7c250c76d8bd358e825df391d7baaa7b42d763fcf83b9bf6
font_02_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 18548 bytes
SHA-256: b511b38f160ea53c9b5a29d998e707998c15c7ebe0de67f01fa430a31ea6bbc2

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