Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a15e7c56408465…

MALICIOUS

PDF

70.7 KB Created: 2021-07-28 06:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf4edcc2c25e635427fbc253bbc1a4ad SHA-1: 222553da36bd2bcfc726200f63f1be19b6bc3b79 SHA-256: 16a15e7c564084655e30992e8400e4c0c3c46a141a8d35233ec3c7bf63eac4a5
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. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9580

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 http://bronia.org/userfiles/file/sisozebapa.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ff43c9e6a738b5d286bf1ed2cee84fc5/87494364274.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/74010678249.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/93vren2f5eonbq96pfg1ehcl10/3597799692.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607517fe9ca07---gaposodiwututute.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/zugawilagavazu.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/karaxojed.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/pagodoja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0588b7c4f---zegimirekog.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bba057631---fugewipoto.pdfIn PDF document text
    • https://webmenuplus.com/images/file/67275597424.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160708ced4f792---52548890484.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/37307175182.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba724f415e6---17005064646.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff3f4c74d9---mamufuteduvujadubo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0db0587c0---jusubewu.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/r5ai2fvmf79csj8281cgecmrva/77539727202.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/bomovetasabufadesole.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68a8360a2---nubinuto.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e93e489fd4a46707fe62d9d76602e243/64171839802.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bvt44ed8gmj0pco2oaufec1344/23687112622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mecanismos+de+transporte+atraves+de+la+membrana+celularPDF 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_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 18332 bytes
SHA-256: 9e6d35c05ac7ce9b800d684255e03989dbaf2febd752b41377271de6b82820de

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