Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3d41b6299a7aa9…

MALICIOUS

PDF

94.8 KB Created: 2021-07-30 16:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f218eddc4a593bb9dd4827374a0191c SHA-1: bf7243b7e6ef2629382e422a5f8c3396b7b9750d SHA-256: 5d3d41b6299a7aa9695dbebebc026b47aee2e6b3f0b13acfd9a256fcf7d3dd27
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the presence of external links points to an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=descargar+norma+brc+versi%C3%B3n+8+pdf+espa%C3%B1ol+gratis PDF link annotation
    • https://vildmarksjagt.dk/userfiles/file/16313874255.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/460a67564f811262a8407c5d0bac0512/30837545140.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e95df2ae5---47828940222.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p2k6hi0pqgb3uumi8v1lbo95ag/wisatoxilosifinaxorez.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2664b612b1---neramazevasuwelilibuzi.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/sopafizavimanuxixesimeze.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/winolapabiboturuxini.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/pamubuk.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a0ff14b97097d8c6ab64afeb1dc382be/6605913441.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ffe1b1ccd---mesufopusirulakej.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef7f4bf92---24321797422.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8225dd08a6---95307107116.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0b26c8d8---vaduwarikepob.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2525fe66069070f3b289f3013b41298b/53154396163.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815a5612a51---jemixax.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b595ddad6d1---94589693229.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/68468284057.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/87921973780.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076617e55f8f---xomelotulififupafuwajalov.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9867411a7---xowowapoked.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083cef52787c---6613547457.pdfIn PDF document text
    • http://tipiland.net/upload/file/68377332575.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_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 17800 bytes
SHA-256: c31778af39ef6e6306b5f03a5b3a81dce221fc4a034e42720fd25bcef7003e03
font_02_sfnt_off00014e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E79 11720 bytes
SHA-256: 4045fe860213a15a6fd5d6e824601cc188aa3380a0381e82d563626b41c999d1

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