Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77926192b84417c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 17:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e3343e8aadf0afcee8e9a00043096d2 SHA-1: e31dc792202521e6a830e35cdaa43b16ff8996b8 SHA-256: b77926192b84417cc0174bed338bf80c7028512d98018447babe10bff622f518
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=plague+inc+creator+apk PDF link annotation
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/24990798406.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/56907772346.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/51949811865.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/95756753933.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/xokixurixeb.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/jogamezisa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5bb16fb3c344d2114ff70dd0eab89bff/vemetosuv.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2ce674a2---46736832061.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/15408291208.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/46970255209.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/wedubago.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/49632974320.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/83970622101.pdfIn PDF document text
    • http://unityproductions.com/upload/files/lifezej.pdfIn PDF document text
    • http://gr-chem.com/upload/files/97805718826.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/93921711927.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/zesofomoduwabeve.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a72fcb1a8032466a2f66102d786cb6cf/61752118691.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/lasapasagamus.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/32473439739.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/tazeziruriki.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/tupulofa.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/46328138215.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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 18520 bytes
SHA-256: 0b309f24fec09a196126e359147acf2fe2505b1bc2b19c1bba4c71acda3ac116
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 10576 bytes
SHA-256: 53e68b5cc30cfae7a376d789b996452f6409c8f5a2a1d9ed4a58d239d30aaced
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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