Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93486be8b00b9d8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-01 08:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba522b13fcc0044dceda971674b1e9d8 SHA-1: aa9da40ea54afc50894f4aa5013ace9092c8d44d SHA-256: a93486be8b00b9d8031522d39a2f0b191cdbeb934af84a07039b472670722769
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm structure strongly suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9032

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 http://maketmaster.ru/admin/ckfinder/userfiles/files/42687437393.pdf In PDF document text
    • http://webbuilders.com/files/file/99576057047.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/887add19939bced055ec3483a15506ee/75674900685.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cff33ae22---56656646453.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/18700103892.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/sujulizebisezowoko.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/resew.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/be5ba36d14970461b17db1a34a0e8cc9/75724550438.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1a648638---94799284763.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/foxagavosuwevijewuxelelik.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/xupenifigaw.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1db4345e105d0cce80efd0dda9b8a812/6309564760.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63694baf6---12667755583.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4t4dhuf20pfet4okfor1a89s77/84950153007.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/18740043969.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t78avk36185ov5r61ucgecuo5n/jawolejumedilewat.pdfIn PDF document text
    • https://susta.vn/userfiles/file/petikebakegubivakexozog.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a4649d5b5b7---vamekudoz.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/46218042875.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/50772312213.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1c4fbec2f2d515944c16e8910ec2223b/gilesunirekas.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/2959648820.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3239e4f9---60308529947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cathy+caruth+unclaimed+experiencePDF 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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 10840 bytes
SHA-256: 3ddfd13edbf09cc00af16062caf82355f6947fa7c3eb8b524489ffa5fc402f9d