Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a03e3e1d5bd74c…

MALICIOUS

PDF

96.0 KB Created: 2021-04-29 03:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e7cbd824f7f81fb90c7f9007a27294d9 SHA-1: 3029838aaa31991b1eed022ff3ca6c986e48ce3b SHA-256: c6a03e3e1d5bd74cf40368aeced06f6bfd2b1717dacb44e951f4e58c6660decc
94 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier also flagged this PDF as malicious. The presence of these links suggests an attempt to manipulate search engine rankings or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8116

Heuristics 4

  • 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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gimokimesobuzuxajit.pdf In PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607100b861fda---besokotidos.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/91b078e070acae5fda98bc2618ef112d/xuzelokubiseguxofox.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077937d378ea---45299989869.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/37b0a28e4b97e7f580f587b3bd7c3b18/82176605344.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160756b2c605c4---lalibemozidedagukon.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc0fc3851---lidum.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/negudumetavok.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa58d7c03---xatufodumomixod.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b2488d25dc4ddf3737a0ad7a5105d375/31929931203.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2de08c13636d22d6324e040651be246d/46276952050.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/579d8b99164692e75b65f809f1b4c685/vikike.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cd548ce0daf7909f83058c241885432/giredurozegeta.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4caf3b18214c1b808bf835969762e3db/34757586616.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffc987ced---79876026832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+steam+api+64PDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE0 3956 bytes
SHA-256: bf4fed95c36377bde47eab38a78b2990fbf118c8ac9150b8ff43b873e606306d

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