Malicious PDF — malware analysis report

Static analysis result for SHA-256 5369bbf9c4d92814…

MALICIOUS

PDF

171.8 KB Created: 2021-09-03 21:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43d552b5f371001f3edecfed9ef5be55 SHA-1: 7d9e5597a3e0b688f5a1c594185b4219eeb7b1bf SHA-256: 5369bbf9c4d928147716a668edf75560fc24a5ba86146e1eb98e44e0c3a89f91
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2761

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bazis-expertiza.ru/ckfinder/core/connector/php/files/ragowevekurezomijog.pdf In PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/70761446958.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b44880a15---totig.pdfIn PDF document text
    • https://tessuno.com/upload/files/610fcbf2310ef.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/22897901352.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/66100d4a0c767c334a81f04da46de091/4596220578.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/raworovakimiwamarelelazos.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/90407682201.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/d3fnfi52p1gjav52g4c3pk8a94/dazigerufuvozodasuraga.pdfIn PDF document text
    • http://primaneighbors.com/userimages/zorosoro.pdfIn PDF document text
    • http://areopag.ru/sites/default/files/uploads/55069253966.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/zepakoso.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/69188487239.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612350393817a---48089591529.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210816234133.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/73064935741.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/zenivipinomarum.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/92498187357.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a6bc16a63dd---suduj.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/83424cedaefda4c9a2ac8fb5216d31ec/barerilenokagivefebe.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108ec5c9201c---potijipadexapab.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/28810733167.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/gefibob.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/bezuvirisol.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/30b32172259f08426cd85bf04cba428b/pibibidibulitixulifelotez.pdfIn PDF document text
    • https://tavio.ru/files/file/gebixiberafoder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=catechesi+tradendae+english+pdfPDF link annotation
    • 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_off00027d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002952c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2952C 10808 bytes
SHA-256: 3455f0b22d1fc011e743e3a805131e41c0da8a2f0d41c5df085402592f373f14