Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2be666a24d50eaf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 07:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15183852ae9c93a00ce55ed32c08d2b0 SHA-1: 0dc6fc51105807b723da4b3a1ac66b28b6adcf61 SHA-256: f2be666a24d50eaf8d7e7b94d651efd63b2e97abf1af932b8e3df9b520ff44bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its 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://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/84383968452.pdf In PDF document text
    • http://radio6deenero.com/uploaded/files/goxiredilujopamafifi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b56691a1bcb---jogevezimofukajilusuza.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/15317923872.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/sosuvajopoziboxewos.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64795949361.pdfIn PDF document text
    • http://vhktn.at/images/content/files/bovosiwa.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/71817955884.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/muxodajaniwebovada.pdfIn PDF document text
    • http://poiskvod.ru/images/file/fujurupobep.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160876c6305cdb---kobuka.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/zepalewim.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/gefogamotajafuvagoxekadus.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/lineroxefov.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/78807628622.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2a07b4m2bk7hr0bakcu7niscsu/37765462379.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f22869428f8---ragewabigekozomuful.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084396a72b2f---38334393823.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/222tgj2g0lfl8vdrgcnkrr2k1c/91688584006.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47e96ee08---70115834432.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/94333014843.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/85329023316.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/94009095387.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/nqk6k5q848vdgdvj1tkbggpqkq/1245029747.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/dasitawesuxefal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=transmission+gate+in+vlsi+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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 17436 bytes
SHA-256: 909d1edc9911f363c434ea55ca1e37b3fac15992710e9d4acbbdbcb387409832
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 10872 bytes
SHA-256: b01de5570266f0448ef9a44b9222a43e82e87b16b3ccfbd11ae80e77be31f165

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