Malicious PDF — malware analysis report

Static analysis result for SHA-256 4523e60281b4bedf…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 21:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3523d8391732f0d9599579e10216ee71 SHA-1: afa6657309d2728a49e8ff545586e611f711a6cc SHA-256: 4523e60281b4bedfe620b7b55ff1c6ce93c83c5dc63fb9c4d91cf464a27a55d2
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://chretkinia.pl/userfiles/file/jotajuvutovakaxoses.pdf In PDF document text
    • http://alexhofford.com/temp/files/file/14158712953.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/dixirovowavolamafafa.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mugesutewurabajad.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/4615385313.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0ac359df9769b1ee7953b367a215817f/95674204218.pdfIn PDF document text
    • http://skinanniversarymall.com/userfiles/file/newurisaviret.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081276bac357---walimoj.pdfIn PDF document text
    • http://vlajamo.cz/images/file/91308739508.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/gawifefukuzejev.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/famekaj.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/99630472853.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/884da9f8e29c466f5d84fd2506032e22/66997162076.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4b601897a218ef780a9542a325714744/repekeboxisimurozal.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec4b3581e3---15711372840.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/65533226181.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/ramovusesomevomubo.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/40142663270.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/tagatexibeberepubudegi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/604f6e7044394591523b3f75f1d4f935/duxetavuperekojojako.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/59549472582.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8fe3a1831d19b9f4c40d8a1dd8f27b1d/dipavekasugotagev.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/88309464213.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/nubelazeko.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f146ba16c6010411dcd252b2720750d5/56934019522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=banking+system+in+pakistan+pdfPDF 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_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 19688 bytes
SHA-256: 30f0be1f6cba531dd74d98a382fb9fef557aceaccc529af06f838be72cbd1be2
font_01_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 10836 bytes
SHA-256: 177e31ea2cc6170d1fd0d6e995164c37c85b1a1586f47c2281b89ad0812858bf

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