Malicious PDF — malware analysis report

Static analysis result for SHA-256 693d9fb3bbc4e64c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-06 03:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ddf72188dc3fcbe8124821cfd4eaf0f SHA-1: fbe5b8b9b8c0dd20c0c67a3bb4441648f735cd82 SHA-256: 693d9fb3bbc4e64c5ea4bb2240db17958421f63038892d4082de2523af3c5e2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards a common phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8296

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 https://inwebjor.ru/uplcv?utm_term=employment+contract+pdf PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf84372480---81791656552.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/91293733970.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/86025180659.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca47862f9a---53263162661.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/rupunidobilutoduwasa.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/58415825500.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/44564715522.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613075341fc7b---39577950748.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/62706024973.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624505300.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/86846658561.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/77753421832.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624539859441669640.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/vazalu.pdfIn PDF document text
    • https://coatielectronica.com/files/xinolesopoxikuzur.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/jawebe.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f53f4a4f7c4---75272624790.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/tepugare.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/fumubebedilexamavo.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/jadugokatuzenitobujorar.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10620 bytes
SHA-256: 77950afe47ae928d678957051aa18272f43b8a55f1cf65ea505dbfa0e7684236

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