Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfee2bd1d39302e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 20:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16fd49c3d903e8a13941689dc812a51b SHA-1: 798c949757fda51c7c99f174ae9717a34bba436d SHA-256: ddfee2bd1d39302e1838d3b37fb0a2b60336566988b17c8a29b34f7d8afc7f3c
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or a distribution point for malware. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised content management systems or disposable domains. This suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=summary+of+chapter+10+of+the+giver PDF link annotation
    • https://coil.hk/upload/files/52567936330.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/vepojuronumosod.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///22392070457.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/tipoxexusorixese.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a1e531218---20605615232.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/84807207173.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/leponux.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m7dm878iv4m7ftl9i3umd0o77c/1108912155.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/11326877090.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/79866246830.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/vagilatipupibuwomusil.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bfa0ee3709530e4cb4c412f3c03df662/mipaboxigajuwulivizavakit.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zijumakekuwarisobip.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352482c67c4---betefomixibixifid.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b5b046c3b---debelejonigomikegodeme.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/88143054662.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613627490ad6c---mofexe.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/95383999763.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/76087193134.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/migabemijor.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/gilenipanugowokajijida.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/gutemaxiseradavifofuwag.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_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 11140 bytes
SHA-256: 4dd7d2d3f47789e3b8dd3e9e07f8d34104b27c7217432ab126be203ef0933bf7
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 19284 bytes
SHA-256: a2c902c61d74028e5cf766abfcfc0b3c31ec7c1131b26ddcb591272ed775a0bb
font_02_sfnt_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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