Malicious PDF — malware analysis report

Static analysis result for SHA-256 105620bbc4209b15…

MALICIOUS

PDF

104.6 KB Created: 2021-08-11 11:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2866f639a223f66bd99fd2a62fa77a1 SHA-1: 60e0212c0199391c2ec307ef1f4f5cefb7be49a7 SHA-256: 105620bbc4209b152b3bd68e70b12bb52acd28a1812db31018a3182098377e5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab635b2a8b---34052393009.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5bb7a10e---rojaxa.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f0fab9e93---tejuw.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609151562f7c4---puxowalederaxeg.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/jeforap.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/85852631626.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36408650a6---46444566807.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/vcbhtd0bmoq73p8u4kfrh88rui/44444689558.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/xumigu.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zemulekeruxowugulem.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/fakolopotutubomigok.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b43389595---73782007556.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/56766955700.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/varawu.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/85781827873.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734ce90b896---nepopetajo.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1afbcfbfc3771797fa9a259a8f6e5b90/rusokapiwabojalujoser.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076316beea25---femeturewowa.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/37b279e9ba00543e76825aa932d3d920/32855026149.pdfIn PDF document text
    • https://nevisnews.com/userfiles/vasuwibowarokujiviwozug.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/65800336126.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e03239640475027587e7fa57b1761494/pufidil.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161082a9de7f1c---nipesubimemalorixazofag.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/kojazufozigumonawufefen.pdfIn PDF document text
    • http://liily.jp/upload/file/20210728055837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=industrial+organizational+psychology+master%27s+programs+onlinePDF 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_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFC 17472 bytes
SHA-256: 503e353ae7d56b46fa304581ec935013af0df5e113890fbf1a7c221cd38bdca0
font_02_sfnt_off000179fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179FC 11220 bytes
SHA-256: 66123e3bf6e193ef675e77d6f154696ba9701a1f503baeb51796f2784176038c