Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfa6a2d8392b40c…

MALICIOUS

PDF

71.6 KB Created: 2021-06-08 22:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33bc6b110110a461697280da514c6aa7 SHA-1: affbe7ba8dc6252ac75268853f62cba97bb0f555 SHA-256: 9dfa6a2d8392b40c83f1791b4f1b07ff7a9ff2230eeba8a904c1919ef58acf83
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which are likely used to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs indicate a deliberate attempt to distribute content through a network of potentially compromised domains. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=ibrahim+tatlises+rindamin+download+mp3
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b204eeb1319---zufesosizowiv.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593164ddb9---fepiva.pdf
    • http://vervesimuhub.com/userfiles/file/55644200123.pdf
    • http://assushop.com/userfiles/assushop.com/file/92198573701.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f75719933---68609793661.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tgurnp88pjl9dr4ovs0qsn5qs8/vomanibojuxu.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ca9072707c5d787e9cb8091358c08f58/63001733046.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/578a63119014212d0d8c34866bf884e6/dekusorulifirup.pdf
    • http://www.lugashotel.com/data/editorfile/giximiwan.pdf
    • http://allnatureint.com/userfiles/file/fetukox.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68e075729---65021670906.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51c04ee514---79004869174.pdf
    • http://dentish.ru/ckfinder/userfiles/files/25832510121.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094748477274---zunopumipidenagi.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f6daaef5a9b7fb3ab3e0a36a97b3f2ca/gulinajezidosaro.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oa3750t5m9a4eccc6p9l5c49o7/8168592165.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbcc.bin
606addb878ea362bfa9c7ac511f948ba001393c91737be7ce55a78d54f716ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 5320 bytes
font_01_sfnt_off0000ddbc.bin
f42ca1a09e6004cebbb732f23734c77280930d2151575dee1fed74f42126963c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 11156 bytes
font_02_sfnt_off0001013b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 4324 bytes

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