Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcf19db4b585087…

MALICIOUS

PDF

95.4 KB Created: 2021-09-10 10:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66a29a392163eea42d121db9cc62915f SHA-1: 7fb68b08a1fcef3feca0eb1df5b99dd2a4d0d2c8 SHA-256: bfcf19db4b585087b0a9dad81c1931844d80b54129cce1b460fa9d0e2ff0949d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kokomanis.com/contents/files/dejimewev.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301972d0e35---3452043199.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/vapisini.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/fozobox.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c93ac2646---20617561647.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/40273801578.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/veginitevife.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/tiluxepotowefugubunibu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hmrvt61t0hhc45n4akpcack7kl/21879978101.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/wawubowor.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/24370498289.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e156716ab---rojixakufov.pdfIn PDF document text
    • http://mlight.cz/archiv/file/29731269388.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/govuwazokedunazeguseju.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108312130269539.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/75406332621.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/36910432824.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/putuzenibobulaguxivum.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/daluxaweraxaxaj.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/dometerebos.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/ligajiwapesijofavoroguzor.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/29960674536.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/toliwisiwowatujefunur.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/pomowuwikavizonewa.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130577386c60---mudavetuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+music+online+unblockedPDF 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_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 19840 bytes
SHA-256: cc6c932e149ce8a25ce079cedeee871a7246d77d9fcb2102b7e6920a383a5325
font_01_sfnt_off00013fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CC 10580 bytes
SHA-256: 9318680c5074e4d87d89d2b5339e71f0ae54a3a32d4295a68992cf8fd3676bf6

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