Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c125e9823a9e8d…

MALICIOUS

PDF

94.2 KB Created: 2021-09-05 19:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d07ff3766e5af303aded6f1190e2928 SHA-1: 752f0c9b5aefc992d22d2b1bde1b6f9f5a09d143 SHA-256: 73c125e9823a9e8df67441ec739554d7cecdc1d23b7c9bf452a24c8a68e703f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=economically+weaker+section+bill+pdf PDF link annotation
    • http://flexicourse.cz/res/file/8084258635.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076479c1cd76---wiwukagezagovepupa.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/suporobematuzozejex.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/jatuwagaxonesawasemu.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kupanuveza.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5e4a1e68a22cdb06248493e6bcbfb80b/94532207483.pdfIn PDF document text
    • http://primaneighbors.com/userimages/tojenu.pdfIn PDF document text
    • https://kar360.com/resimler/files/59453965412.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/jiturizolilaberarovizof.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/jezumexufupone.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/vunenorenogopawiwaz.pdfIn PDF document text
    • https://chpcentre.com/files/file/99848496656.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a645388601a---bitivamusavugadigemelup.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/fibugivexutitorima.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5cc3f14f4---29867750272.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3u0e9m541d186tg98bpp9h4du4/60686955724.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/77721211550.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/kibulesagojenibudumilaj.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/lubimabitexubepetidurele.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/vilipa.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608db357890f6---natedujusumede.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/68841129309.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2845026f28---44610589213.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_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 17888 bytes
SHA-256: 62ebc7965f77f24bcf396be85e3b4703cbe9613f6a6dd7d04758055f1e10364a
font_02_sfnt_off0001518d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518D 11196 bytes
SHA-256: f5f2977d1539d0a64b0fb9cb405df319653e91984d560f8bac83a57498a99473

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