Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ee886dc9038dd4…

MALICIOUS

PDF

98.5 KB Created: 2021-08-18 22:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fdeda86d7ca9809fc0d5edb669cf8f3f SHA-1: aaaf8a1767cd8a1ab6512af67fbaa64a48a4d19f SHA-256: 05ee886dc9038dd4a9b5901e7e78fe0cdfbdef7e99247e9e449c8939545c6f65
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 point 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 0.9989

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://bomberosdenavarra.com/userfiles_nexo/files/39924266901.pdf In PDF document text
    • https://noticky.net/akce/fotky/file/52478707369.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/lokomuru.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722eb13e3d9---labujisenokinad.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/45756751366.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072281f17ff3---dozetumofozudarutafum.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/cadv64fc73lk58bj85ge2ju2ki/sowumufig.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/fb3dcb1101fcc8953f293adc5bc75753/korabew.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/dutut.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/84821143281.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/14c63e99cbb368d1648d2495cad0997e/kigomaxiwurewasew.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0fedd3fd---mekokesosimarosakuka.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/47926938491.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097903a5ae1a---94175440103.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c5e684509b9adae8fc91560260c9eceb/pedelet.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/wifogif.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b1b0985f---94829255748.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ad5da6e43---revegubelaxulukor.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/94712060246.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160842afb7b416---7738264283.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/57227094072.pdfIn PDF document text
    • http://splogservice.ru/content/files/bumapoxufixopapunakad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=geometry+problems+with+solutions+and+answers+pdfPDF 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_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 17492 bytes
SHA-256: 68633bdcc8e8ab559972bb07f7ef4d345363278e1d405948e90e07724319f235
font_01_sfnt_off000148ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FF 11240 bytes
SHA-256: a433fc20c2b7db1b1817966be8de64027a1bf51d4adb076906b6818d8ebcb6da
font_02_sfnt_off00016305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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