Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2ea57d16c88936…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 03:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 16e73c6a1affbf33820b5dcb6e3c1b6c SHA-1: d0b0c46849595beb651454ee14d0168cf5a0bfdd SHA-256: 9a2ea57d16c88936ee0a099ba3365c4a0f3a2d7e87444cc59bc21dd7765167ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vj4ruf3lj50056051qh248hu7h/2873139666.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/juzotofup.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8d44d502250cd1e8ce5070471399fa9d/4562540431.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080919ee90a5---doponijodimubuk.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/nuxin.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/95892775256.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/xavomevu.pdfIn PDF document text
    • https://nevisnews.com/userfiles/45372020910.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/womiz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608151c64b3c0---76849434278.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/vunoditusogutezefomono.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/8461824818.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/23353623406.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44974dff39---pelomamaxepokumusipo.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/44093938500.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d3dd34272---80242465338.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/dugebixe.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/purazimedi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8f1e2d67b32e52c5940c0fec898757e6/38206269715.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/newexutujurujumaburobex.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/nuwososajepuvozosuvewiwu.pdfIn PDF document text
    • http://surtek.biz/image/files/20150114_233644.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/452e514487fb653a50f69ba4fb134b6f/dajajoragijesivakewuwes.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d39a50d77c0---gakozadebutufugif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tipos+de+argumentos+en+un+texto+argumentativo+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_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 11024 bytes
SHA-256: d3de71b463d6987a80c9cfa250c16ed22ac40ea840b8be231b747ef535dade41
font_01_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 19816 bytes
SHA-256: 0019801d16a4fd2ada7eb14465e39fe588a256e4c38d906960070269205b4421
font_02_sfnt_off00013f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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