Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee0eb7cb0768d85…

MALICIOUS

PDF

88.6 KB Created: 2021-07-06 16:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7a75dbd378ca3f6f37dffa7b84fe4373 SHA-1: 3edcedd088d3de8facb2eaefe8a0cc9aa93eb995 SHA-256: dee0eb7cb0768d858a8e170b556fd899f32dd2dc1028a7765be0d05826aa6ff0
196 Risk Score

Malware Insights

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

This PDF file is detected as malicious by ClamAV and a machine learning classifier. It employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware installation. The document contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm used to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6d2653a3---ruvemof.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/0f05bb829b650e06a23955e26132d5a4/misog.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8de193a62465a78a4a0eca3f3b5032cd/xazubolajagu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/46189581954.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210618162051_2ztz70.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7a209ed6---7669246075.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f86a9da3---90855671140.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/37bbb3b6caf11472c7c5cbed0c8387ff/4009523051.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/gulepevivu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77af75db9e---84573740161.pdfIn PDF document text
    • https://digicpictures.com/downloads/patubujuxup.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73e3ae63c---bezidesetokozevigife.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/36778005586.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/eppb65lkfv27u01l5m6sv9qoau/23078212292.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/764f67f36402cfb791c6bfb6fd7cb72f/17807890496.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ccf144d6774599f86da6a1ad69159b77/17188680909.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ee5cbe1b---dukova.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a9a18988---netewitupirexor.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/51872678128.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/25931633067.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/46543558243.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b21f40062---miwakujibovu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867abc27c---79437179494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=applied+linguistics+questions+and+answersPDF 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_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 11000 bytes
SHA-256: f1448db22ebf25fb33a85e17603ea4857748c93e9a4c1099e3c288c4305dd147
font_02_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 17380 bytes
SHA-256: a5460973f5385daa991f6b46f1073114248c6f6261686ce0a09ee91c5902f349

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