Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2b852094cfffa7…

MALICIOUS

PDF

91.2 KB Created: 2021-08-13 19:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 725a6ff117109448b8067c52c60634fe SHA-1: 971b23b9ac808a2c2a1394c06b7285923cdfd6f6 SHA-256: da2b852094cfffa7be3b6989dd6c6c3142ce0d6b41cb4ee8b85b709733e8b453
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the numerous external URIs, including those hosted on compromised CMS uploads and disposable domains, suggest an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=what+is+the+difference+between+yamaha+r6+and+r6s PDF link annotation
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/bcd752fmv7v1g5i3fq2o9b4j67/memorudavakoxawenenejul.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad52746820---lezijudoxobewabab.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/43955553734.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/wediremovizoxojeve.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/wewofimesofebagage.pdfIn PDF document text
    • http://medica-brno.com/files/mesifomalugezivo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8c82260e2a---34552838893.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108071756205264.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/zosuta.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/39e1cfe4224dad9e2ff31ce26cb5eea0/fapafevebifafam.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/jolufolifadoseba.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/betugediravoji.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/97f77d30ba7cf207b0dd0e80def35551/14960692614.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/15065106467.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a928a1634c6---12417852086.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/fakapima.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/batomerotitabumagi.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/22987170148.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/lujisodusolalum.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_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 11076 bytes
SHA-256: e6e893dc1f7884c2b455ab76fb8044e0a2ac798e7b76e26013411cc8038a4d7d
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA8 18048 bytes
SHA-256: a5489941ee68d723fefec46e02dd84c459747580385b612d00b75527eddf9eff

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