Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08ddb504edd576a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 13:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36d9bec43f83f11208945a313d3f6895 SHA-1: 4b02901219fd4f0488e8467c04a8e2052b3035bd SHA-256: f08ddb504edd576ab03f8517877cd338a52515764faa9b4bee1d00cb9a71ea25
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

Heuristics 6

  • 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.
  • 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
  • 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://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/nii6rq715dr318kqsjhn8cghlo/viziruvabudedojuped.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8m9prdl0qpeqeo6oveibns7q01/fowim.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/30071866556.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a616bd85d---tesobamemudinolisis.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/gufoluxen.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/7e57540b65afa026251a001a90e6d115/41766250755.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/wofekizujimotivamuxuwufe.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c7bc3af5---miwigipirexulededi.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/lozakulazituj.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/mokuwamujax.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7ab425f2353e8e26bef25af9fbb0c7ba/daxejijebunepifevavi.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/73489618195.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/36719230135.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608862ce7b58c---32141370624.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/kotaxolobokusejag.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/aiur7807p63a7v2aqrddapjbq1/85512667504.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/xurujuxugurikaw.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/48362333871.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc8aa53ec---22772926439.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0d9e6dcee62fc84ded143d4d179cc7a/sepebifavisufelubekuzodu.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/89693375895.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bdd96be6c8d811227f8c19c16028b9f1/degelodabobukanig.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612e0c1da4072---3767948688.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6ef34d73---mebexifemex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=apress+beginning+python+from+novice+to+professional+pdfPDF 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_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 17796 bytes
SHA-256: bd593daf2f90d7f7244232721157098e5c2daa9c5692822229bcd1e9ecd914cd