Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd495cff391ff10…

MALICIOUS

PDF

65.0 KB Created: 2021-09-04 10:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a2b35b4b5d3b29fd032a7a34881b1783 SHA-1: 4648e7748b38270bac98a03aa675d3637a1b2594 SHA-256: 9bd495cff391ff10719dfbe733fb116d7ecbc9f24bfd8ab4b58fcdad66c81adb
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8723

Heuristics 5

  • 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
  • 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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5a9281ec40d3daf3dc1aa9a77333d5d8/93001159996.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c41299743dd---23387237395.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d310837e53---pevimumogofosu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160798e0e3db78---temonuwuretuzum.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161231b2f6a82e---negaxo.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/99773836332.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/loniposepusimuser.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ee2c1d698797a5a5a287ee60a17d7d09/59394529672.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/282148445930.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902172232.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/bepinawowuli.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/nunamazugatoxuxotojezuj.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/u5l5mk877v8273t3tfjv3v1qgo/kasifufalodovadozexutuvip.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/bigujabixamuva.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/gonifog.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/26698495912.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/94563053636.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16095d209dde7b---53961906774.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0cj4b7b9h1838h35rb7eh6r8t3/dobevurexexazilegutusir.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/06039c17d500e65462429b720287f1ee/povawasegivojexaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=se%C3%B1ales+de+transito+pdf+guatemalaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 18624 bytes
SHA-256: fea83bde4c56cc8102d329ad7dfeed1ea8dd7243f648cd0d6fd9a922d6f7f7cf

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