Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef1ca24c8ffe07a…

MALICIOUS

PDF

68.2 KB Created: 2021-06-18 20:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ced4e2a624358f37c4d7b4ab5e180d3e SHA-1: dbe951a1de16a4c00428bc5b9381636adf2f917d SHA-256: 5ef1ca24c8ffe07a5c3f412d3604f3208c9b8663b6482c8863cbf12d8abb9e9a
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update to view content. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic. The presence of numerous links to potentially compromised WordPress sites and the ML classifier's high confidence score further indicate malicious intent. While no scripts were directly extracted, the overall structure and heuristics suggest a social engineering attack aimed at compromising the user.

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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab7647cd9---20324976181.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbe9eeb60---giravemufopigaxuvopixo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b1d82430---17093583496.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/731a642b9c832f38143c1a590f8b03f6/68924208095.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846e15a87f---rozagikij.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c81a57ec5---pezisarukap.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b9a51666---pavaf.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/67883634630.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/22263386283.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/82644460361.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/82859404050.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/24959515282.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8to9lc6lm6eg33k3g18a16hjjl/nulodabibu.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/38751718297.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6crf87s02mte0135i3g2jve415/kitenilunawagapudedupuros.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e37b168bc9---fazesasepogezupoduweno.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f7e9a0c79187b0352c762ea1f9994f26/7835060473.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/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=decrease+size+of+pdf+online+freePDF 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 5196 bytes
SHA-256: 83c4baff82e7cb0df03b8313467788aa6d51c5946bc551e0e5c8c692ff4dd965
font_01_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 11496 bytes
SHA-256: 01155070c93448250ea11225c06b5772d28218cdaad5fcce887b737587a51a2b

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