Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae599ef860b54de…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 12:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3936a9ccf5ff24fe1185af1b3a82f40b SHA-1: f287c75d3291a8b7dd9d9a4c31c501a8978e90d7 SHA-256: dae599ef860b54de32681d470a26cf5ef62be9788fc71da7fd9acab754b4af62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristics indicate a link farm designed to redirect users, likely to a malicious download or phishing page. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://queure.ru/uplcv?utm_term=pc+mission+games+free+download+full+version+for+windows+7 PDF link annotation
    • https://subarini.ro/mm/file/fupasalefudidimepuxupuja.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/muvazutefafukogagome.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161340b58e79a7---92258380072.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/wajididinexuxosuwawiduke.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d709939d54c74fc43b6b7d9dcf57df3a/59168228645.pdfIn PDF document text
    • https://sergiomauri.com/images/file/60900106136.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/78633581130.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bonefejogogukoluxe.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/kumelagiverutomuge.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/tonibovinupiwo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/livabazevi.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/7861398752.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/60494607398.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/90013958236.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/zituzuke.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/pujabuvux.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ffc9aee9---18114467348.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/dilelipib.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210916_4349CB18386E67E8.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27813019663.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/62503497919.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16155d84a987d8---raxagotilibuvum.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/81795030160.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/moketor.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_off0000af61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 11024 bytes
SHA-256: d2bbae8292c0bd3eae38083dbcd4a2540a3a9d1aeb8f2084f26cb86c60f9da1f
font_02_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 14840 bytes
SHA-256: 399f2828a6de6cbdb2dd7bea125ba8ff9c1bb4e8da80eb5ee159ba0301e7ffed