Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb5224b85c577eb…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 21:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03ff72e7da678d6d5c6d756ed953c073 SHA-1: b73fb83c253713ecfa8007e674bde97efe7d9a55 SHA-256: 2eb5224b85c577eb041dcdba1d3f993c056d77692c95f5628f4ac3deb2c76c3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm designed to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=how+to+rename+app+in+android+studio PDF link annotation
    • http://studioego.cz/userfiles/file/94416192868.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/76390143490.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/bajibimowimebelubaxaxeze.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/fuzafoxujumajapuwa.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/gudobipijupuwad.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/55200859587.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e295158f59---54952993598.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/42ec5a05f82c4ce2ee365d210706bdff/86222824740.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135bda757618---29188668599.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/xuzunat.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/38523193888.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a8bf96f54b9f27f8417c7ca8105165d4/zovigivafatokuduj.pdfIn PDF document text
    • http://wwstationery.com/files/file/lubewajazil.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fdf5512f6ecea6b0b8e2023261ad94c4/7750741474.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/54632571459.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/949805705.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/381891194.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xozaxewuw.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/rilolebepebapabiribegojim.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/15115525445.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c0863cba---tusuxokaluripos.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/26539782154.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/14888765750.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_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 10684 bytes
SHA-256: 2615e8f51b592d3e73a7bbef7191cb18b51e4ec6ae1638e1c2e1c8c6bea72d82
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 17284 bytes
SHA-256: 1d85b093a56de6189ba05c9b2d3295230b33cb3442fb4a4d9d2383f00068c0c1
font_02_sfnt_off00013af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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