Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e06b330d413aaa…

MALICIOUS

PDF

89.0 KB Created: 2021-07-08 12:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2f6cff5a1ce409c6b5cbc49c988214e4 SHA-1: 55d0f6f0844ca3a65494862f747f03f2a4644475 SHA-256: 09e06b330d413aaa9bc1d79e1634f78090c2e583fcb66fe46e687be3201916d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS uploads suggests an attempt to leverage legitimate but compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://schmitz.cz/res/file/webuk.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97e3057d3---dajibewikomipore.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/jetunix.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/7761050329.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/63864764d7017b0d55d2ded489acf780/41477712686.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/665fd5ad1ff07ec3dcbd83c528832a33/megekazifitarowi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/93a1ec7d3f5f708e1c4b542a23f111be/82719432508.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/rujobuposini.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/rujidavatunesazeroref.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076676da7b2d---26480035277.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/iken976efcl0sb31ifdf5d9r2d/musarewoviberizidefa.pdfIn PDF document text
    • https://sfilatinogourmet.it/file/68053011314.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/62517263931.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e00a1b8d61eceabb27aad57cf01ae4a8/78710811361.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/bepidipevevowom.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/boxotidepev.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7d25svthjlhgtl0d3j0h4ucbtq/xafalitabewo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/80707436035.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8397b6efc6141bde560f4c4685b47ee7/10041054776.pdfIn PDF document text
    • https://nada70.org/userfiles/file/32545554239.pdfIn PDF document text
    • http://2440027.ru/upload/file/mogojurajipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=introduction+to+engineering+mathematics+by+hk+dass+vol+1+pdf+downloadPDF link annotation
    • 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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 11668 bytes
SHA-256: 98023d755577260d226ae9a2a152f795536c080a34be516065c592836cfe13fc
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 22968 bytes
SHA-256: 74287d93e96c4eabfe1b77adc3be3569411dd5b33cffb674ed3e76a2df362745
font_02_sfnt_off00013e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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