Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b4ddfa70558164…

MALICIOUS

PDF

99.0 KB Created: 2021-09-05 00:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3699eaddbaa4df0a5fcd7d1d51a0e6c SHA-1: f4085618d8866a1e34d2dbaa85df65c2455933ba SHA-256: 18b4ddfa705581643f32edc5ef59b7d8e1e27d150b451e7ac9818f33ca2c9a95
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://goldenapp.net/file/tomowatimevufujalugusanog.pdf In PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/71210847892.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/5020e6d69eed29783a8678a05bec03e2/38219046836.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/964705676315338987fc544049adcc94/bezisaguropilezate.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a52133111f9ddfa0fef8610cffb9e13a/37992948221.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8a0a9dcd4834d329a02ef800fbf8f7fd/ginexatetemajeme.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xapafakitaguku.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5257dacfc61a8885edb165f34c0102b9/66092328021.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/zakewesolanusugegumufumo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/tamusadaserexapaj.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74f718527c---bikinupeseve.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/f64q51kiqtdtie1lhlhcl6gv04/nukotenowegipirolu.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/goxoselisos.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/relojakutijino.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/fosakokodiwuni.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/7266523372.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/76114171405.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/62370514455.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/xuruxenanofumoruren.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6062dedf9---vesipev.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/pofibobovajinokot.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/votef.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c21a1ad0ee8---megafes.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/tuzajupigijelogobetog.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/mafumelumovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=quantitative+trading+with+r+understanding+mathematical+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_off0001102b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 22264 bytes
SHA-256: 6fd08e48db01261335c69162eaed7564ed5dda0fe354869fecb5ac4288376a84
font_01_sfnt_off00014b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B56 11256 bytes
SHA-256: df07517b77f41c752143d8c20c74834cd648150f77f4157853f866a62a601d53
font_02_sfnt_off00016583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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