Malicious PDF — malware analysis report

Static analysis result for SHA-256 57968169d4d9ff6e…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 03:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5746e64b5972cd144a4cc9ed5d0297f SHA-1: 22fab6ff0f3376718890b46d02a6b5dc72b1201e SHA-256: 57968169d4d9ff6e3f620b9045489decf17e5c20c1f780632c2249cb0b4221d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to host or distribute malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=fatigue+during+third+trimester PDF link annotation
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a567026065c---ligosadezawevofemeneno.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tifewubog.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55a0bc8d8---zamox.pdfIn PDF document text
    • http://jarosi.hu/files/file/kataxutisolidodosaz.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/67596819213.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/3330913486.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac13ccca63---9918654813.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/81042446430.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062911542198.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/vopejumemoxexubowanun.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/dabeterasixagazut.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e2b4fa7ed50bcbf6b6538e69cded81e5/wopelula.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/70a015534946132227a8ac9f01bad2ef/75171948595.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/ferimuf.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210829_100047.pdfIn PDF document text
    • https://ekransamara.ru/files/bebomubosozajowusoxa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f1a98d41691a4bcea37b6eb3b62cba85/42806586226.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d406932969---7679926411.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee220cc3d---daxuresarafa.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/fibitafabageromotubonesa.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/62b2771b7b223d5fd29ef19b18380f6c/20154967417.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dc69b58746b9c97493e37ec80c74a09e/80417318307.pdfIn PDF document text
    • https://vestol.bg/files/file/jilesesibi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 10604 bytes
SHA-256: a4015c1497fc1276d08f76c0f6fd4391075211a8be38a7ee03fff60606c2a7e8
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 16996 bytes
SHA-256: 40585f43c55791fc6d01fb5b2a6ba8b4950626a54fc0fa3787ea73259069abf8
font_03_sfnt_off00013838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13838 17368 bytes
SHA-256: 597df6bada935255cad37a5385dab4081dcc6a79c625a6b1049487ddd4d22501

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