Malicious PDF — malware analysis report

Static analysis result for SHA-256 b705a5983606397e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 21:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dabe34c3cf3dca7dc869d9b1a6869e5 SHA-1: bc7954661e1d1fe46f9b028ca0e9816fb64b25c8 SHA-256: b705a5983606397e75c498797ea47adcb826987aed0faeaebe44b4b8aae87ed8
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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://essentielles-theater.de/UserFiles/File/73491373675.pdf In PDF document text
    • http://bluelakehomestay.com/uploads/image/files/39935184688.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/mezavofibupovikuvos.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/35673500548.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/figubosojaze.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f789010be7---xazivirefegevibesofuxito.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/37231979520.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/64718998556.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/donunuleze.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/80966067200.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wezofurexaw.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/favekasitisow.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c6e61772c---54871311447.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3d39681d---70523046442.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/17535440847.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76e4e8f92d11e9fa6f668459a9f7eacb/75335171397.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/lipujava.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/2296757342.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/fonizirizoduduliwufon.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/25217058179.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/tavedes.pdfIn PDF document text
    • https://eniedu.com/data/file/20210911200831.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/basavuterepawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kk+emoji+keyboard+premium+apkPDF 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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 19908 bytes
SHA-256: 0ca57099c37da04e96d5b33748445cd5c4b229d4f5baceb49c60553e26a68d44
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 10704 bytes
SHA-256: 5b465daf1203cde4194b6a70b8e66af2a8a6919768fab1b9dca2bb93c7c7f737
font_02_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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