Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d41dd7232fed23…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 01:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0aa91347d4c34439c6a31162c04f4a91 SHA-1: cf3f44133b22cc122747910ad9b314ab95760751 SHA-256: e6d41dd7232fed23ed8e325c90b7eb658ec0b6cfdc2d9c1d20658731d2f55ac6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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 http://madiran-cruduparadis.fr/ckfinder/userfiles/files/tibadu.pdf
    • http://koppeika.ru/userfiles/file/jawufusagijemepawimup.pdf
    • https://benmoonpharma.com/userfiles/file/55135586707.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/cc107833d1ac54f5716d34cd359fa944/9898358675.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfa2b645c---pifuximet.pdf
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/3179667384.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395bf31edcc---nigajuxupo.pdf
    • http://kyanite.tv/userfiles/file/jegogilogatapovi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450dbc2f6dd---89072857838.pdf
    • http://satyavnetworks.com/fck_upload_images/file/bazaxuxa.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614136fdf3f4d---fatumakironupefe.pdf
    • https://viceda.com/userfiles/file/jusesu.pdf
    • https://unique-u.biz/images/uploads/file/82282799434.pdf
    • http://didaconcept.com/admin/fckeditor/file/74897729986.pdf
    • https://digbijoynath.in/uploads/userfiles/files/jakoziredabexiroz.pdf
    • https://isigakizima.net/img/tmp/file/83175871647.pdf
    • http://jfe.hk/userfiles/bumeresamulewu.pdf
    • https://zoldlaptop.hu/ckfinder/userfiles/files/7637339932.pdf
    • https://martensmgt.com/business_school/uploads/file/26121205538.pdf
    • http://njchemland.com/upload/files/51911043400.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2352d340---17052616807.pdf
    • http://westernmaki.com/uploads/files/jarak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hack+client+minecraft+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af0b.bin
a45771556f959f754abd4055c49415f513ddec27cd6474f01180acebde5e41f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 15332 bytes
font_01_sfnt_off0000d5da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
font_02_sfnt_off0000edf1.bin
fda5c78312ad2f5fb8fcfe148d01ca56d3fe61a7acbc55ab7ba03b7973ffc0a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 10980 bytes