Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e48190c2d63b64…

MALICIOUS

PDF

78.8 KB Created: 2021-08-26 22:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86d72f97413be014f9c92be9f7047b79 SHA-1: a549b658f856415307044bdab439e285c56b8fed SHA-256: e0e48190c2d63b64a9ebfa348b290a56bb6bfae2cd95c951ec8d560bd43604cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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
  • 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://queure.ru/uplcv?utm_term=types+of+stacking+in+warehouse PDF link annotation
    • http://vdadanang.vn/app/webroot/assets/files/92103481806.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/22077110302.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/sojaxesimokegusiwuguz.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f4245ea9---ribomokovonopuvajunaten.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b703342edb---putukofabobebezakaj.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785d36be932---64491141454.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162518294717.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a14ab6903dab5d0691967a16c37e3ead/13701453202.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/48f2888d90708000b005ac6223817087/nagebarug.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c57a621b9---dupos.pdfIn PDF document text
    • http://iphysiology.ru/upload/fibimagexigun.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba3f1a76e9---bojirutumab.pdfIn PDF document text
    • http://bptramptour.pl/files/file/velujipedugesozidabulo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jhj6pka70kgeq0imamicsf7bmi/revavosevatiripi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27045de34e---4440167009.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/76d0ef5d5733bcb562ca8c46473cc474.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/tepomesu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mslve1sn0nq3p349abf3d35lt5/4214989917.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3ec539a058ba8c98d18115326de30601/jefamiwovowavozego.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/liporuloposowelefotas.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f6d9ead0b---sopulifonobalojarokorub.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8a19dc27662bab03f1cdf5da45fceca2/vodajoralikomek.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1bd8683f9---jajigilena.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b0e5cef5---tobufegemedapativeb.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/51130366591.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_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 11068 bytes
SHA-256: 8afbb8c07fec4a81d255ada4d216d6e9348d781ef708ecadbe93d4abc13c8204
font_02_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 16072 bytes
SHA-256: c990c9c6cf032aee3b27b355c21d705a4b88430d65089f73983a1f929f10741f

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