Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc7c62f48210989…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 13:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 294d17ba297b32d245167ac2d311f1f9 SHA-1: 96ff6be69ef6ab37a6e53d8f0f08363103ed1849 SHA-256: 9bc7c62f4821098935624006caf436405778a47796ebefdd476709e2127aaf46
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=best+online+web+series+app PDF link annotation
    • http://frutapac.es/ckfinder/userfiles/files/zukigezerururigaralon.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/67964075860.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/27268626384.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43058421373.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/fafovonalumuvinenaliw.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nidevofidufomesowexajeju.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7f3e5fac---2673204626.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/giluzedu.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/wivuteda.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133897e52dce---mesegidigo.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/xanoparixalarimo.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/31480304724.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/16730931211.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/vefureti.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/38ba497c67955102ad259cfa9df263d9/42345382723.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/78b33486b6ae4deac2dee8f3712e4035/18033002192.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419371c7a84---nunira.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/46198521473.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/30089972510.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/52379577515.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147151ba2b66---680553494.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/dojesidokopozojaje.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/lusufexumowakaju.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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 16872 bytes
SHA-256: ce92c55c9c7f69bfbb04bac27546314147ca74d512570416c519e18ab44457fe
font_01_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 10524 bytes
SHA-256: 2f0bfd601f34bdf58edfe74af11605c7a1d181cda48948096045bdd106f2d532
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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