Malicious PDF — malware analysis report

Static analysis result for SHA-256 a668513a6a7ec1ce…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 10:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4efc9ca98045bdf3f587a19067d52fc4 SHA-1: d4f2d6ade9f00723b2f96887ae5bc0094f9764a0 SHA-256: a668513a6a7ec1cef73674d6db9f29985b55eb3d069d0d8a2b0381679e0061a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting. These elements suggest the document is part of a phishing or redirection scheme, likely intended to lead users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://superplasticizer.cn/d/files/tugumorob.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160797e6025649---detuzufuzipoximuxizuximo.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210619_202019.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/67975022802.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/kutog.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/sejewekovajirulu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6612ec459---lijam.pdfIn PDF document text
    • https://wagaskar.com/media/33794520479.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/mosimikefusoxeburax.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/921e91b95c8f51a24fb7d59d8dbfd996/danefukopoxigurifusurori.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/jujapotajav.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/92489274819.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/lemubuzelupaku.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/68299501050.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082697e82d6f---juvatesatoto.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c910b0bd3---laxinixufajaxuruxilenug.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba832e3a3---6784224729.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4c430d57---65079038324.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2e73dbf30---kufegalowolodavufugadu.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/65592399202.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/30008243202.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/28057331357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=2013+ford+taurus+sho+owners+manualPDF 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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 19568 bytes
SHA-256: 1d0129e6e8422ef6b503c909a4ec3cfa6aa0ebe241ac18412270d7cccd99b609
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 11084 bytes
SHA-256: 47849a33a696d7db4dacba4386920c748a4535e262743fb3561c62476568a649

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