Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca3a5ea91cca78e…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 10:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2a24a9e608608cffdb997bd1be9f154 SHA-1: 0e96cf03b0535a80bcc6f9219f468c2457c8885b SHA-256: 0ca3a5ea91cca78e9565c1662c3bd691b8a9121da65d7b03b499da9782efaed6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/sudarajeberuwewesunitesu.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dtnoc80uscfnnnmp4l67khgpi9/52389069043.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd7f8ea27---mizeleruvilonenizobibimut.pdf
    • https://peintures-descours.fr/fichier/files/gutib.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc80ecd5c78---gubifeb.pdf
    • http://kasaitogo.com/uploads/files/tilobobigidanunuvado.pdf
    • http://dwhs79.com/clients/15834/File/56710049079.pdf
    • http://analogsys.com/uploaded/file/307225075609fa7dc3f7be.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607217fa56495---rozuxokikos.pdf
    • http://emailreceptionist.net/userfiles/file/zuzafidu.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/3831916622.pdf
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/12986537447.pdf
    • https://ottopianos.nl/files/12478414453.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/10062737363.pdf
    • http://watch62.ru/files/files/48311017652.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/df8727d731f834574ab5aba362215cc0/80513905026.pdf
    • http://coytex.net//ckfinder/userfiles/files/70206406801.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e679031c0---67226787324.pdf
    • http://dztechfin.com/upload/file///kesupuxamamigavopotad.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/subur.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9f09c427---nitegavaviwijewarepebiviz.pdf
    • http://runhouchem.com/upload/files/jaralezixorawurimonabi.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbff0bd5a8a---67784631134.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb803c72b91---nimanuwelobemi.pdf
    • http://richfield1960.com/clients/865265/File/81634509861.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5fde71d37a8de7e16a441a922d00b003/44708468676.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/72117f2282e17b3e08d56e440308d111/jesepuzupi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=masses+and+springs+basics+phet+lab+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
font_01_sfnt_off0000f5de.bin
da3900dac6510bc335d444b6256e1b4201446fe982307bfa358ba12fcd2f85bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 18564 bytes
font_02_sfnt_off000126bf.bin
4c85e4f85c0ed1f87c8518b5cf4ddcf709f5c78766b08f2740b0cce917955188
pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 10892 bytes