Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce1f93d5825e086…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 06:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc3dcd586382d59c2670086380ab1a2d SHA-1: 772d1d18dc50c995b362704171a1b5c4c050626b SHA-256: 1ce1f93d5825e0869c66655a19361faca2db71e3d4702ce890ce2b42c46a70b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://leesman.com/wp-content/plugins/super-forms/uploads/php/files/ad96379f48b78b6a24504017fa0d4541/83054095322.pdf In PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/diwamavevisesesoromawoma.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3263d69d6585da92a4de26616e2f1fd0/79630567349.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/12937053738.pdfIn PDF document text
    • http://surtek.biz/image/files/20150108_214424.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/xogafotowumagegexukajita.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7675a460---niwev.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f986a895816dc4f5fb642888aba49a57/34741991246.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/25907707866.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160985a4a951b6---31278924093.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16115607b02e13---neralepiru.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/54524913435.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/likabimawudukivot.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1031b091---19673535084.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/wadavibo.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voxakizexojumevusuguxidod.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0np6afkol9fca2793r364fchms/loxudakusovewik.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d64acf571---govaf.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/4941131450.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a79034d7851---2130445813.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/xatidezomezujemox.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p5tmgnckl13hph9kk6dvu4hfu7/minupekaz.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783fbacf800---fetenoziwak.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0e4d9a9f511f7e0e58a5f10443d5bda0/kofogipi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b150b8e5---41247774648.pdfIn PDF document text
    • http://scpt.it/userfiles/files/sarose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=holman+illustrated+bible+dictionary+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_off0000ba4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4E 15336 bytes
SHA-256: af7d3e378837ccec62058ad9433c72e34eaeef32546ad85b80fa98687315370e
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 11128 bytes
SHA-256: 39c70dda275617fcd5772f0a746a410c0ccad7991b8200ad0fb4a2069f42f294