Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb0f56829c05e1b…

MALICIOUS

PDF

74.4 KB Created: 2021-06-23 00:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d6c43f0f64fc8cd2bf3a0f8a9046d4d0 SHA-1: bbd3a79eb56e69bef67403b18adced976c5160ca SHA-256: 4eb0f56829c05e1b4e2f3ceeee23aacc56b0671b73a30e62224f58d146b618f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension to facilitate further compromise. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest an attempt to host or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://guides2alpes.fr/uploads/file/penutekuvuse.pdf In PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7dc22dad29804531c6dccab8a43bba28/16161814358.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2537f566c2---10531650131.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/31176676845.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0d4b5be0---65529792387.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/m9flivj8dle85uu5rqd832o0vu/53433400197.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/10801151208.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/70073ef0792416a9e25e36fbbb876fbc/bavozalusefofela.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a28cf3e3c6c---86524416950.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/texipagireto.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/sumukodurofarusijiguli.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/liwirirozovonaka.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cda33b76e13---lebanu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4e5d9787550dbd0340994c8296b7b5f5/60589149591.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/5468423260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=convert+pdf+to+web+page+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://scripts.sil.org/OFLIn 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_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 5228 bytes
SHA-256: 25d2afc291ad2193bfa1110a82095bada7e6b44d02001014fab99cc411191fa4
font_01_sfnt_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 10928 bytes
SHA-256: c04a143ead54fbec66475f130b549c6278af5edc7e29760a1567dfbb95e723ee
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 16360 bytes
SHA-256: d61bb0c462f13eb0219a6616ede8d70136a9476cb557ca878f5f4adc20a858f7

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