Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff79d889945a38c2…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 09:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd699dc1604e79c7aa86debf71d95036 SHA-1: d6db8c378ef22bed014198b3dae521b077a92ed7 SHA-256: ff79d889945a38c288a80dfaca74f9729caddd1b90a8cc85a6d57e5a3b7bcbcc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as a phishing trojan, and ML classification also flagged it as malicious. The primary attack pattern involves luring users to external sites through a deceptive PDF attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8856

Heuristics 5

  • 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.
  • 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 http://shrlie.com/upload_fck/file/2021-8-30/20210830171617392320.pdf In PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/bunisoduwupitupuputigu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3fbc6f1fae1d7bd6ed67f2d0085a3e65/bunufibisopuwimexesoweke.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/wikuvofakuzotobifepapigi.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zodoxavat.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/40f3072a062007b307b601c1aaf91f1e/85387002624.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/pukowelobebexiwadete.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607094a53dbb4---41551608260.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9f5f27d3---40917084705.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ab4114f7dda58012e95b34001871c1c0/1386305232.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/muviti.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/gewikegexemagerabolen.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/pikinetawuxunegok.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/89620419816.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/99726631704.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/pubunutixofuwumunasilo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ff8095738844b1c005419c103f1c5f4a/2481808860.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/48405373954.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd837c9bdf8---13158844949.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3a9f33b52d4b07891eeaa7de4097fa0c/49455094324.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/mewamumi.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/79830848470.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/72830104640.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/91094935227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=team+operating+agreementPDF 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_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 10344 bytes
SHA-256: 02d8b840e1c8446e8fef28f1bd1b0b91e913784f2a15bcf7cf3c7ba9983e528f

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