Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d14d4b99ed3077b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 23:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1953866ba70d1d5c5cca310f003dfd80 SHA-1: 9933774282d79ed8ccb0d8acbb5f43e1bdb1efed SHA-256: 9d14d4b99ed3077b714efaeeb172e92891b701ae73afbabe290b782e9d189e6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=starbucks+nutrition+pdf+uk PDF link annotation
    • http://wsystem.sk/userfiles/files/239640788.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/87424633230.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/tewewonawatigudanilavuk.pdfIn PDF document text
    • http://carszana.com/image/upload/File/genopedosironakigepirov.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xiduwifisi.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jiribipenif.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf5c8988f---vizite.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2abe26079a---janewomudisoparafegivuxe.pdfIn PDF document text
    • http://jaht.com/userfiles/file/55434118033.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d923da94726---74928177285.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/231d286d0f40e2a7c916b45155547b79/kudarezava.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/25919718867.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098358492ba8---jixivefalivotozoluseku.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvus.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/rukuvulet.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/31/68960467158.pdfIn PDF document text
    • http://jfe.hk/userfiles/43860420967.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ae8uloqol22467gq35i0phus5k/83099489718.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/28215297269.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/mixipikaxitajejamukuw.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/josujenijaz.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c46c424aa---695257844.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/14157482681.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/ruziji.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/lesuzofazexiwaxawileni.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_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 10840 bytes
SHA-256: 3e4c44e6f21bd81f978db81bd0b5d67e0cf905ea0026d76bef5c848f2fd6590e
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 18252 bytes
SHA-256: 85448a23276658f80a83ad0fd160401c993c35cf90c4c33b0337b89074feb2f6
font_02_sfnt_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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