Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72f5bde84bf2323…

MALICIOUS

PDF

73.4 KB Created: 2021-09-27 22:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c36acd20ad718b81ad3b7a017cc88b39 SHA-1: 04e777d196ef619416f9a4de3498e015debd2a9d SHA-256: b72f5bde84bf232303034ff910427a8be76b613ffcee0ceb9797c3f19b662b62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The 'utm_term=file+transfer+xiaomi+to+pc' parameter in one URL indicates a lure related to file transfers. ClamAV detected this file as 'Pdf.Phishing.Trojan', and an ML classifier also flagged it as malicious. No scripts were extracted, but the structure and URLs strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://samuiluxurytravel.com/Uploads/file/77365676776.pdf In PDF document text
    • https://getracemirates.com/userfiles/files/5231942773.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/60870451437.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/3833364218.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/xidadefatavugepenipibufov.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142df8003fab---wusijadazatasaporusepa.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c78953ef47---67584884411.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/jonapuzejibugif.pdfIn PDF document text
    • http://yejida.com/userfiles/file/68897035800.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/sokerakeradebora.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/ruvepujexamibare.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/95462084978.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/leruwo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7b844d45---83328822584.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/83817696150.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138599f670f9---77580059321.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d17e7dd060dd2b985d43b31d61d94c8e/bapegusokateterepeme.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/masovotatisabemoveki.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614229c7a68e0---fataba.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/4585000343.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614146a2b242c---naturijirutazevurusifoloj.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/fanakuxaneforuvexadez.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/40584465831.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/46564104200.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/gupabiroro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=file+transfer+xiaomi+to+pcPDF 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_off0000b77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77A 10720 bytes
SHA-256: 2916b03abb833c3c4e332c70b4f323f7d40f541ff4321449c0a929251741f11c
font_01_sfnt_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 18444 bytes
SHA-256: d4fc448e5cd07e08732726a60b25e384241914ecb82a646cc29d2569b8e55e69
font_02_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1