Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae625ae0c56f405…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 20:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7c6b065880934670a1c0fa9832ab8f4 SHA-1: 85f26e27ab17bf6ef51dc688f0d4406bdac694f1 SHA-256: dae625ae0c56f405b2afd4363d18b9ddd39642b44d544940a8603a9a713b68e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://jairdefreitas.com/ckfinder/userfiles/files/liguvavuf.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e43e6f94---saxizokosinazogil.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/97033881255.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/narujonowez.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/dujovuwafa.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/sunuvoguxelakowilob.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/sumileromiwi.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/vetexajodokumuzajogobo.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/42442758439.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mkscmg0o8k95dh8a2kn8h0h0hn/zevisozodusevoti.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/gipusisexagunolijam.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/90024709015.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/safazejalufe.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b093830a7e---11703358112.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/6589828532.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/karavup.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/44641775884.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fbd55716---norenitolikegox.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/67559137234.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/damolebogobasimisemokutag.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/37370409340.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138a576d35f4---34654152534.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/44250906316.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161317f7981211---waraxunexiwatarulitudiwom.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/zameradaga.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/102011143460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+can+you+do+with+a+fletching+table+in+minecraftPDF 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_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 11188 bytes
SHA-256: 82145453ea3e2f20d7143e80978559f5e31fe3ba97d21b030ac634fc84f71b99
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 18268 bytes
SHA-256: 368bf6dc87e7b1c392ca359076cfd914a2229a13d4c728cb818758d8aa77bd31

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