Malicious PDF — malware analysis report

Static analysis result for SHA-256 b298a5ebab7c46e9…

MALICIOUS

PDF

86.7 KB Created: 2021-07-14 02:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8adbe5d2512c67a075fe91fdd224f134 SHA-1: 91de1e01ef7a38c8f2a383667fc6ff49d8f5b44a SHA-256: b298a5ebab7c46e9d619d844be0740c05d207e89fd3f210d8666785f7a42d690
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as containing a link farm pointing to potentially compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest an attempt to redirect users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/529d1a8963ee985e30e2a4504a9d9d7e/juketaxa.pdf In PDF document text
    • https://alnahamgroup.com/userfiles/file/buxewuxugabapuvavagade.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3a216a6e---4033710556.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/17173664584.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xedavejaxizat.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429010246998996.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021060617451873499.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5bg6g3n20h1rs7cf6lmg8mkevi/ninoberugopus.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/27144254084.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/70830286789.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/71613749852.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9454cc590---24982613055.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a3nl7hpvnquq6vkc0f4icq2iui/91887972123.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b430db7c810---dekavixo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/77191776056.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/paletulefegiwadigarulawol.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5ffb2bc6a442554bbf9f0e75ac4f3ec9/7400018299.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/sesenozifor.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f4607245---54557415653.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/vuguvekuxovoresifem.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee01d66ddf6---33930318417.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad864ba832---farixiwaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=subject+and+predicate+definition+and+examplePDF 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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16968 bytes
SHA-256: 828ed57e3e8d07f58d1d110789d7bfa515133b4bdaec265ae3167dfc13396a55
font_01_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 11160 bytes
SHA-256: 4713917ac1773994e17d5ed305c844b084e492956f012fac19463ef7e2c6d647
font_02_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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