Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbc8f75d5143031…

MALICIOUS

PDF

76.1 KB Created: 2021-05-06 18:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c47268ff9036b7b6377e38854107a7f0 SHA-1: 2487f755b9ca211dcd54081482e02bd70af6d710 SHA-256: 0bbc8f75d5143031bb883425f8125b664a26446cb63c18ba299db83584e51b3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing campaign. The presence of embedded URLs and the nature of the heuristics point towards the document acting as a lure to download further malicious content or to phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=osrs+crocodile+slayer+guide
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce6d2795a---fimozopup.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lf417ashpa97slg14jjvl30kt3/sipamoxu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/27e4eab0acc15964db19b21da116dc51/wirer.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7a288a3a---tokavapokosu.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2af701dec---40239623263.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/75be3be8cd7b5a216348ea03106b824e/duxuvofegiwoxed.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1a9bda93c25df92607688591097b52ad/35703611845.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/be9d815cbe6207574783e444996b2e1d/wekizonujab.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ir31743kdl405esocb7p56mj62/jevaxe.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e4220a0f7b4f6261548dc6fd40dfe1c/75994384431.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb9929ce81---kigigavuwunitomaduful.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935b2f47f8d.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a62de0cfe2---4301012145.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4b6cf63b---67804434995.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/05d66500290a9cbf4aae9b7bba85f788/satipu.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba0.bin
1810a56c06149c03af9035699891224f1a8014ccc9f98d1e496dc164c54472d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 5236 bytes
font_01_sfnt_off0000fd81.bin
31e1723bcecaa5541a1561aec1d0a1f18078614532994ecb317c77f99fd613c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 11304 bytes

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