Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9cd165553d49a3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 12:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78b0b2c33af2dfff1dddb557f41de932 SHA-1: f361b0daf56e416588e741d430dfb6b77545084d SHA-256: 5a9cd165553d49a3db65f4d6f611a99f79aa3185b91398b5667d5b90913d9bc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern observed is the use of a link farm to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://oniceh.ru/uplcv?utm_term=mortal+kombat+movie+2021+kabal PDF link annotation
    • https://bacninhonline.com/webroot/img/files/66965359550.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tfc9jhaegljuusa4eijdsq40f7/guzuketes.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/71549530785.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/84704434486.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/6737842525.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/64885484631.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/29245264938.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5df75206---96383285901.pdfIn PDF document text
    • https://vleek.com/uploads/files/raperorib.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/54739975590.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/39218021973.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/pemuzopunajig.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6137349df12e0.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/66608021094.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/61893494867.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/fozavirumusobikaj.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/80533199847.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/xanabafuwobixexariwefemi.pdfIn PDF document text
    • https://luminex.pl/upload/file/jasizilemuw.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/pesawojado.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/3781449499.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316480697db---zeminijob.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4a011bff---votononisobufibupenilana.pdfIn PDF document text
    • https://proxus.nl/file/81944813386.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219914123732.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 17392 bytes
SHA-256: 27fefb422d59930bcb8744a4ea0341aa6f52f2a20e7e9038845ba633dcb4c6a6
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10580 bytes
SHA-256: 33e0e311422416fb2985358b28d84319d87f573307ca227e8cc90b939c93dde4
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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