Malicious PDF — malware analysis report

Static analysis result for SHA-256 75db3321c39e0050…

MALICIOUS

PDF

54.7 KB Created: 2021-09-30 13:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf0f8540059bee6c3c2f4b628dc1739c SHA-1: de9daf40639d6769c711e131a16955e943c57ba2 SHA-256: 75db3321c39e005084da22c786eb02fadb8e5631804560ef8672bf0797609c18
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including one pointing to a compromised WordPress upload directory, suggest the document functions as a link farm designed to redirect users to potentially harmful sites. The presence of multiple 'link farm' heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6873

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://mondoaudio.it/img/uploaded/file/79376665586.pdf In PDF document text
    • http://bluebossa.pl/files/file/sagibitazejarumetuwo.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/47103736661.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8c894fe2b6d32c7852f34500eea8fb2c/90011332785.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/72624642914.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/94211683379.pdfIn PDF document text
    • http://xsteelstock.com/d/files/zewixiguvok.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/79188399557.pdfIn PDF document text
    • https://bloc-immo.com/images/geravegaribusukizu.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/pivuvixazetavonunerixab.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/rolep.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/12537673757.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/96784109111.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/rukipuzagedibetosixezaja.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/xozapoziloxanebobax.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/siduvakexudizepojare.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/xopalidixapi.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/91208843326.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/89071755123.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/sixobowigomivula.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/zomaluzipojuweputidobe.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558e277fb8d---77361687411.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/kagonukalopubatog.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/xofixi.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/nileduvibewarolelit.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161433d06030f8---10457098364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+pitch+perfect+online+free+123moviesPDF 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_off0000b546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB546 11148 bytes
SHA-256: 90e9aa14b5623a6515168fb658e997b530793e7a8cffb8c3ea47b61a0fa9bb28