Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10b5bd1fc1da045…

MALICIOUS

PDF

109.3 KB Created: 2021-09-08 10:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af05d44d0c4602efccad94e19361448d SHA-1: a3ba1447373e4aa09aa90aed392fbe105c4d5571 SHA-256: b10b5bd1fc1da04587748aa33525aa4cfe0ef2126439c0090f4eb45bfc4400c2
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common social-engineering tactic. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting suggests a link farm used to distribute malicious content or redirect users. No scripts were extracted from this sample, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://sjhrz.com/images/upload/File/rifivubonupuwiludosejef.pdf In PDF document text
    • http://kielcenoca.pl/files/file/matakuwanideb.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089a48f308f8---bojikaxazuzowigutewumam.pdfIn PDF document text
    • http://fteq.ru/files/file/tixuxogizizomulodubex.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/46295013098.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aee3cd2e0---71602833786.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/236ab513d6f03377617123fedb3f7bdb/67735717099.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/xoxanujomagoj.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/47880656691.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607027940114f---powepozomuvisaxovi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609634df6aa84---60294406311.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986de1ba605---66743731149.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea50f48130e8ea5ef5d104604fa63f5f/tosufepoze.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/31ce4f9f8d2f5ff0411a6e9b9e0278ab/dunipulutobowopotuleg.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/32158413159.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/fuxaw.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/03739fa42b63d02aa77e7a61948b3e32/98455093747.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60961b63e9---77532209913.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7bcda46f1---16458497139.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c11f2faa075c207b8549960faaef148b/6717153094.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/82050452995.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/96723814954.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/30789507168.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/28086488785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=semiologia+medica+argente+alvarez+2da+edicion+pdf+descargar+gratisPDF 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_off00013bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEF 21736 bytes
SHA-256: 3aafa0c437e3d74ed03d5f60a9cb8951d206d59aad63d8c65471a6e84ec2111a
font_01_sfnt_off000173e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BFA 11284 bytes
SHA-256: 0baee00c36e5519bcc9c4b198d21ba87b2df5ab772b649396707c92d9c86f86b

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