Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24d0f1d9d450bcb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 23:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4f24e6329b0e3d7038ca75c89f5a371e SHA-1: aaefaa463db61d41704420a9fc80dc2fd9ce2a7d SHA-256: c24d0f1d9d450bcb7f35f433e4eb8ddfd4e4e83fec77118f18067e3be308f9fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=lulubox+online+hack PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50673e932---xolimiki.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/63532233235.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143a1cd4ee5a---26827259856.pdfIn PDF document text
    • http://prestopc.it/upload/file/weburofoxivefatawekuvize.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdc8bde936---92422890534.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/3502194016.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/96451209395.pdfIn PDF document text
    • https://mediaskills.rs/files/xamezixi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/45221593681.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/55335405908.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/xuguvel.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/nabusunajotoxotese.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/tazikewosijomitalojul.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/xopalidixapi.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/lafusuxozomudapureg.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/37878327140.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139129bb3bd5---konejarijeku.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/299683462.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jowafodefeduzoxememaw.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd35b860cd---41137892501.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631188394.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/17699131529.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/22543459432.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/64135699916.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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 18276 bytes
SHA-256: 5b8c8d13bc822f8c6632ae1861e3a728a19af022a6d90049b7fbae15908a764b
font_01_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 10352 bytes
SHA-256: 76284d10b3c175d88ea666726a5744764f8751f65c269a4aa4340fa88d703f85

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