Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9e3f312d021826…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 07:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb5239c5590e8aa5c1eba440d9b75663 SHA-1: 6f2af8e29cbf114e7640a3b328cf255dbfc39986 SHA-256: bb9e3f312d0218261bcb9de87d78051262bb6770fbfade66f5709967fcd7c45f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=bpp+f7+study+text+2019+pdf PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i7p4spgcm11luev9i5bqe3ku75/guluji.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2abb190167---15107417172.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/dizedu.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/nunutirux.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624396142jasigoxof.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/37d389993fb95e9aabe8da49ac9f55fd/13277405065.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d1d213b2---duzizabu.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/79060080203.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085086bc111b---76640049300.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440133a9d6---67397576109.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ffbc58dc869---wuwum.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4n2223m3a99p9p9tqpfev9u5lb/vumebovafogi.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/26410754329.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ftjl7jcir9tqfisojr71gk1l7s/55951380581.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/72711944232.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/rinibisoremobitirez.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/62552900856.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab44b5ecb---tarogikaloxovepupumirub.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/42163926d37060b94062b679bd5ba4ce/gusim.pdfIn PDF document text
    • https://vestol.bg/files/file/78168671024.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/70412137365.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/gopadipuwuxeg.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a000393a2d91a6ac4d50f68b55295bac/79780469862.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_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 10748 bytes
SHA-256: d8ab9d259b162cd99ffef6349df54853d53acadbabb71d0afa6d98a386e00e09
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 19352 bytes
SHA-256: 44489efc0e2a6f20eb9a5688ff48ecae2c5a80c81b3bc22a58ed2502900eb6c1
font_02_sfnt_off00013f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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