Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8e428a0c576f76…

MALICIOUS

PDF

98.2 KB Created: 2021-09-18 03:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0d16d5a50aa6d702117f558581898cf SHA-1: 905c76a15b0fd643a450fe9a916b52799041222a SHA-256: fd8e428a0c576f76deb99e494e8eb57ad2331085e2ea9e3e3e051103cf1b713f
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 uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to external sites through a seemingly innocuous document.

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 http://birons.net/wp-content/plugins/super-forms/uploads/php/files/865ea9f51c24714b1e8a762f6414686a/zobukedonasolalimu.pdf In PDF document text
    • http://maskaevlawyer.ru/userfiles/file/99091681047.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/morev.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/81964851535.pdfIn PDF document text
    • http://rapet.hu/files/fagerepenof.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210902_40A73549C964FF80.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/majawakisifabexexokux.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xabolamo.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/xixewezexobarejekukakut.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/duxoselobibasubipodijegub.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/kulomidizegenitujobo.pdfIn PDF document text
    • https://znalac.com/userfiles/file/53424324577.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16145289c0d12e---safaniwoso.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/rutetekosegikexuwulegig.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/xagolegunin.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/196265338.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/paxunisekure.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/20343135023.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/eosc78m84339u3m93onou2lp77/24110925288.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/jupejoxemapegito.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/83640034079.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210901171004896096802.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/61091922030.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438ea92e6f9---mekometudafolivefotegami.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/20566542692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=structured+system+analysis+and+design+methodology+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_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 17732 bytes
SHA-256: 124e8105293b62b63e893cd735dc9683309a39cb17a41ca1638d5eae847e9d9d
font_01_sfnt_off000147ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16005 11356 bytes
SHA-256: 58b8a9ba7bc76115c309fbda0f4f62e0f025b067cee2a9f207565dd401a10aae

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