Malicious PDF — malware analysis report

Static analysis result for SHA-256 f695ad67430d848a…

MALICIOUS

PDF

96.3 KB Created: 2021-09-08 00:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c351d1290f7383d10a07ce2ca7e5f1b SHA-1: ab41c734f78f86b71a635546508bc72a67f52ba2 SHA-256: f695ad67430d848a9e50aa5bf3cb68eb78ebe3a2005fbc57da101a6fee9de304
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://auto-spec.ca/fck/file/52086658585.pdf In PDF document text
    • http://chonburi33.com/userfiles/file/logedinamawe.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/kekedakodolebow.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/pivupuwazogeje.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098633a144bc---41902482.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a375c5264e3---zamerodeniwavopupudifa.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/78121640455.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dacf73eaabb6fc14d2caf452c0434bbe/tuvugas.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/bomibebuzugasekuv.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/nononexeteru.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/19524337210.pdfIn PDF document text
    • http://honda-vo.com/upload/file/xogulifizigefud.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/fijajo.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/32505606583.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/67763906755.pdfIn PDF document text
    • https://wrd13.com/force/file/dukosuzerutudamimokuvune.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad0443e431---zumagarise.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17b5b0a7f---mepugulip.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/16913163301.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4df80368---6333821063.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/nujupirefewero.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9dc764eed18aef863199d3ffcfbb3ea2/balexiwa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6e6a0706---patokovilopokadejisunino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=overview+of+working+capital+management+pdfPDF 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_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 18680 bytes
SHA-256: 73dbeee0b4cea4df02de95d4ce4f019308d44c530ad5473bfb2ee0faa109ccaf
font_01_sfnt_off0001416d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416D 11064 bytes
SHA-256: fe0704f378d9e4777cb9045b367ff66511884c9388ab787e8562a347b3ca55fe
font_02_sfnt_off00015b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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