Malicious PDF — malware analysis report

Static analysis result for SHA-256 399b57eaa2c4bee4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 19:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9a92e1103a1dfa22d2c5ebfb897a7b8 SHA-1: e9139cbc442d8e9e7fc41cd3e511992440fb8f87 SHA-256: 399b57eaa2c4bee43eae6d1b77748e882de82849cfaffc1d54f992d6b84bfe56
164 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. This suggests the document is designed to exploit a PDF vulnerability to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608700d128bdd---kesawofusirojatisaj.pdf In PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/7267818012.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/11618324598.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/wizedulutinuvuma.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfde6d65e7---fesuxurapazogurav.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b644f6f2---7422356146.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/josopezomifutimikog.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99754909204aec7bd6bc7a8ae8aa7ab1/18308107682.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161194b28d3538---72467514339.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/fogumuwuni.pdfIn PDF document text
    • http://chinalabware.ru/d/files/47886261685.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/fuvufifona.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbe9a491a---niniwugixawanof.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/vutatasabaxebag.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/karodalubezivukeredexus.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f516b5ea7ad---31648793897.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/vexizaxotezajibat.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/kezirutogowov.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/46484761035.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/56509767632.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/patobon.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/40946504074.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/besidilibelogugarowat.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/netadelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sigurd+rascher+top+tones+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7ED 11028 bytes
SHA-256: 420b4efa68e078163d9d4b754b825c619818b5f4b079ca5244f72a832c0efea2
font_01_sfnt_off0000d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 16284 bytes
SHA-256: aa509ec758eb08a55f2085b92ae79558c815bcc17862c05cc4a3ca1dfc9979fb
font_02_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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