Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cba04786a108660…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 14:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2033edf9dd4635da80cc78a0e39fad07 SHA-1: ef5c7bbdc49243497b2195336bf8314446d63d71 SHA-256: 3cba04786a108660d86cbbc2612ed01956ef791ea4b0e70e44e7c6871255c3f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The embedded JavaScript stream, though not fully analyzed due to obfuscation, is a common component in PDF-based malware for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec38e65ea8---71322517159.pdf In PDF document text
    • http://519pf.com/userfiles/files/zajogu.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/60303725979.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7eke03f5dgn2o4i52mepvh5f87/61417054355.pdfIn PDF document text
    • http://badgerhillfarm.uk/laduragigewolozomop.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/xifogizemisubajolesodil.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d6264c3a9d8bc0784dd7e8f87c77c481/13228351702.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/2737941133.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c39bf3894f40bd8971ac81babe6ed7e8/duxolikepofoseso.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/wibigosisuga.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2cchnbtu80fol8usunl7cs0eg6/pabujonavemevonugegaleri.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160707f420188c---16242858150.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/btkfqaev02ojapu76hvk4k3842/ribatonozusitawozafejipoz.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b0467691562dfa8c6b9164e1ac949e64/17607921527.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088bab1b6053---zesep.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/sesuzirekure.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f36c827302f---97408635695.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/futafaxi.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/42974695159.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/29510160469.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a39de9418---fovotekekenexotepadapubal.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b51df77bbdf7d304149fef91473a51ba/18855036337.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/tegiwivotiwilisidikaburum.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/47452387388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=delta+shopmaster+band+saw+owner%27s+manualPDF 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_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 17248 bytes
SHA-256: e2a518ab81e9bb1f5a2f9535e63dde816f4f6dfe2c1a1325e5d7d03f4fef52d2
font_02_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 10924 bytes
SHA-256: 0bb251f2daafee28d45f3e1f644bed54980468bcc2f8a1d6fba8264fdb83a960

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