Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43a4a6f2f781a3c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-11 13:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5503f0b32099e09c97b2065586f001f0 SHA-1: 8f18972bec0dd20e5762b7968d4c3d4d872812d2 SHA-256: a43a4a6f2f781a3c53d9246469c7b214f403663950c777a36aa4e8e501f990ea
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://bivalyracing.hu/files/file/12592185788.pdf In PDF document text
    • http://jenan.com/ckfinder/userfiles/files/gonuzozoletaditisaweku.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/zafirezatuzunez.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/10827748487.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/17771692525.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ce2939e90d9bc186ed416fe4ba9d7712/babowarusapotogajubebeg.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9512d112c---27607337902.pdfIn PDF document text
    • http://hflchw.com/upload/file/3096081550.pdfIn PDF document text
    • http://taxfreepoint.com/file/94320899872.pdfIn PDF document text
    • http://orderkai.com/uploads/files/25123109878.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/39852593432.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/bupodulijelov.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/15492653066.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/tetozumogexegoxoruli.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/mibojo.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/86095832151.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/18830602400.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/9304274900.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/86900845828.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae24bef35---41475439085.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/22658956287.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fc700aab810be15f1111063dbcc6511c/wavubusur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=malayalam+bible+quiz+pdf+free+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_off0000be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 11032 bytes
SHA-256: a0cc092d415ce2d10cc8a6180f24dcbdc7e89dd3b586b13af6953e90b9873d16
font_01_sfnt_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 20692 bytes
SHA-256: 070e6662cc6b68b65f8c15ab83201eec7a43ad0384c6c676aa6235152aa8f8d3
font_02_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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