Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea4638ff4d2bf18…

MALICIOUS

PDF

86.0 KB Created: 2021-07-26 06:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85443bc63481165de1ab507260c8454d SHA-1: 0fc87124c87533c1316bbc8ceb956817de33378b SHA-256: 8ea4638ff4d2bf1818be0219018f3f87cfc635c30ecf5bd6109b7810c50d799c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The presence of multiple external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fanaf.com/article_ressources/file/labibigiputisaginizesagen.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c939f93a5e4---52531526673.pdfIn PDF document text
    • https://activepymes.com/pub/file/napaxebenufereri.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ca42749d5d0854fac464152ca9b0d11a/21647074792.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c56b2633788---lovet.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8956e88e976ca15c526a14f1a713cb40/70187088552.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d516f1e249310f61d719c1b1ca74a1d3/85084305591.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/abb2bfd794e53a5a21d197c1983cd408/sinopazariwibibus.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vfnl3sj1mrc64snn2pk9n48r4u/xabokezojezavafaju.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/wipedofepewigimobel.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8ff0c3233d17579a1506667e4eb2d621/litumade.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/sebagunanawaza.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/tiworegukuzew.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/89455294512.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18067718413.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/silizifeb.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/zerozobu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ead760eb906b1946be3aab88dc97652f/98895965533.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/67482384387.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/boluxewemafafafimigodagis.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d8efeef9e370bdc8e1906927cb9bf56f/72720910212.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/kofagibobum.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160962fe80dbb8---motelumunijoxemaviponiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=guia+pmbok+6+edi%C3%A7%C3%A3o+pdf+download+gr%C3%A1tisPDF 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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 12108 bytes
SHA-256: 1acb2b67b97280cf8c47e98a108c82f9e44c36eade1fd9ba044277d0bba588e9
font_02_sfnt_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 19596 bytes
SHA-256: e6aad05bcb6ff0e5a32caed61ea76f1444543dac37589edf52ba39d82b7e3bb2

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