Malicious PDF — malware analysis report

Static analysis result for SHA-256 9293362da5e5d4b4…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 07:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7de200cc9c8be137b997570f6918f33 SHA-1: ba481cae90eb0f00a964f641ff2ecb6cfd057853 SHA-256: 9293362da5e5d4b4fb37938e6ef2ad7e12b2fbcc073c8fb01c0194cbcaa2736b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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
  • 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 https://cructi.ru/uplcv?utm_term=abusive+words+in+korean PDF link annotation
    • https://locoffice.ru/userfiles/file/fopobifesovobumojedutijug.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/dasopifarojoxe.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rknlf3btnj262t56qe3c81he8k/zasixamapamazororogizubiv.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/dusulomanogapaloxiwuror.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/nalewo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613258b081a4b---2375293212.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b519140dda---jotawoza.pdfIn PDF document text
    • http://chemicalengineers.ie/images/35825747431.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/waxixozusokevimiwu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2e9f3d81---20989406317.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/11075963332.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137940eb167d---vajigekajug.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1c2bb002c---vewujeleser.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5fd2db17---nuviviwasulidow.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff07f2e75c---gumasipazupajinuwabuw.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851931c3e3---41778547027.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/tolubaxalojaxamimudegu.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/83579840429.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/19311518645.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/17125097030.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/moxuxekenore.pdfIn PDF document text
    • 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_off0000b43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43F 18612 bytes
SHA-256: 6c05f389105c3ad7337899688b72b1197ab1c83af5b90522f7a33f2280e93fbe
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 10564 bytes
SHA-256: 3b7a8599a754c5f87768b2526e515c9b826099c0917ea5bbe6414ee8b269906b
font_02_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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