Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bbd37162322516…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 15:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb7fba09f22e9a5006c12a3e542a1f82 SHA-1: 6f2c3bd7f78ed70e7aeea77784fed0bc26f01b67 SHA-256: e7bbd3716232251699245854931140c1044f51fb5d1b1787825e1667754ffc49
154 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The PDF itself does not contain readable text, but its structure and embedded links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

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://dtd.com.pk/ckfinder/userfiles/files/favekokijamokep.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2277915f---wojeturunuru.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/92520715798.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6kcmgn7pnvgncdqfle3827noo7/99034473656.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/dugonop.pdfIn PDF document text
    • http://dhf-china.com/d/files/lefuwuguvobanimu.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/92830100577.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16113e793dfa5c---tokatafifarimulofemigi.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/fudema.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/62157459584.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/zuxefe.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a768813753---mutarilagizimiwobufax.pdfIn PDF document text
    • http://bdn10.cz/files/file/73614106707.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/25681991433.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/vojiwomomebawew.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/823169528.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0e2891b9---86861922170.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/sasitotin.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/14370914957.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/7rbufvk1c3ve616r5tp2bun5ij/juripezadanilasaj.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/518900386ca1109aa3935ed28a38ea32/55854580468.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/48419529659.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612c6459296d2---13623152391.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/2373656406.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/30306634859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=practical+algorithms+in+pediatric+nephrology+pdf+free+downloadPDF 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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 18280 bytes
SHA-256: e522ba28c13642b0a8e2e5fdf68d41d7869c57c86b8ef0103eaef9b587365981