Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e25c3ee0dbbf02…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 04:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 116a6b65c75642843dad112a26b0253d SHA-1: ad910287ef810bed3718223098b742c6f913d4e8 SHA-256: c4e25c3ee0dbbf0239cf27eb29662998d295c2bb2b9cf9492c9b25f4e9edf9d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of multiple external URIs, including those hosted on compromised WordPress sites and disposable domains, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://4bzsoftware.com/Images_upload/files/35039962263.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/51036364732.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/84424557794.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2bf124327c3ad3596266352704ed2525/19734619806.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3a37179b3---toxix.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/masatepafekevovet.pdfIn PDF document text
    • https://baongochoa.com/upload/file/xerazegojixasebapuneda.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/lesidabupunosu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cf0015d501aa854bdd156cc39938d99f/40549917138.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/jodolo.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/loxufupobiwotopek.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///noranagefezavigujevo.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/76344582496.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/sadadokupodojoxixam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117cf873e4fd---fiduv.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/pijanejopej.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ge3berphcsh8uqeg0qp1bgtfl5/xigitisafarewasi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7bb3e5a4c---74973775366.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/94036ec8da91d332b99a06802a2acdb1/86849644579.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610751fe356a0---47813992165.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e6d34266---kajadikudomuxitibiben.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vtralpsv925tmtmnipfnrf6fk1/70313498019.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a596182626cb568a51e639498dcf87c0/fukapaxe.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/durefivozowixideperakaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cooking+temperature+conversion+chart+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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 19180 bytes
SHA-256: 507e86be976b1a8403178465432f236749dbc36f723be01798bb6c8c82a15053
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 11308 bytes
SHA-256: 78b411a92a9a97e2582a507d675630c719dd0a2636c9ddf615f226d991bcac04
font_02_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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