Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a858d3e4e0d642…

MALICIOUS

PDF

88.1 KB Created: 2021-09-08 11:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c43307901d43b55c57ee1c61ba757c51 SHA-1: 37794b32bdc443702b04b3b78c4701318dc367d7 SHA-256: c0a858d3e4e0d642620c5ed9fceecf5ff6fedb22b2154be5cd608f65c0216c67
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=english+to+kannada+dictionary+download+pdf PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fad68df34---balivanabuwozetinipozo.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/fonuxojuribamizovisexi.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/dukefodorerixasepogotagef.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/sugesuvekatawoxedit.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/69280429313.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8227ac039e---pemam.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/68234687102.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/60219998894.pdfIn PDF document text
    • http://htwy.com/upload/file/kenezilevepugijuterubugu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/voobnvoecjq8s22l4dumht1o6v/devok.pdfIn PDF document text
    • http://chapelguild.com/images/usr/puwefadigozilexuxanaf.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/92960866286.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/12785584123.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/4632321706.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/56129739814.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/6087676416.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/51680575203.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/wisipiwedofopibefa.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/drai4gbbuksjbpsupht5tgj221/favopebigetuz.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/vugexeroxekigisox.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fe2597b274275c7eecd46f1256aa2731/7534065801.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123677e46cf6---15625460867.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702205aaed8---diviteguzinaj.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/60839275093.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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 18984 bytes
SHA-256: 79d7a284df946ff5e8aeec136bbf60f7ea1c9bfd4eacb310a0c1561dd8a6666f
font_02_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 11044 bytes
SHA-256: 3d91d32676220536477d3f5b74ed1e3339eaf65dc381e21d8aeeb863aa9e85a1