Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2ee6a19369d302…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 18:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04d97bbd2c7a9c2adf1df1623da0c8f8 SHA-1: 44c59f684aae0d35492207721f6c216fbe2f4125 SHA-256: 7c2ee6a19369d3021993b96dc28f93a43e4b15d44590c909328f3f50033798f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=croods+movie+online PDF link annotation
    • http://life-worldwide.org/assets/uploads/files/pawotidozo.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xaxolemezidadeketukulis.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/84128382934.pdfIn PDF document text
    • https://datajournonepal.org/files/misimabar.pdfIn PDF document text
    • http://12shio5.com/contents/files/kekolelumuxapidixewoles.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/xedebirugupixu.pdfIn PDF document text
    • http://sakem.org/userfiles/files/sigasumemebulixat.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/kemobaxidexibe.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/lenesorasawapokex.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/4022835804.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430efad76b7---vamepegiva.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/84496772453.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/xiwokibedaxe.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/xanavopitekikepaweweg.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161432734f408a---foligufetomekitak.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141387d78f84---55307191047.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210912060505165.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109161926205295834rcy5.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/26224528539.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/pidenilugokanudixodozidu.pdfIn PDF document text
    • https://hinaweb.com/upload/file/lekepel.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/zaxozisafit.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/finivapalebomidelekuj.pdfIn PDF document text
    • http://abworder.com/uploads/files/5266502192.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355b6d69a6a---vafopilorubodozupogita.pdfIn PDF document text
    • 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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 10244 bytes
SHA-256: ca995c7bb6f6ba4605f1d075f877570cf2b418441f43c64432e79d54d421b850
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 17272 bytes
SHA-256: 41023972e2d81d9b88d0effef7a8bc981a4fde3fa425a7db6c30820e4ce11885
font_02_sfnt_off00011ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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