Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bc575f2a0398e6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 08:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 822e4f5b7214b2453b7518becf46d3e6 SHA-1: eddaabde5ae110359c02cd009c4a582be6f7f3f7 SHA-256: 78bc575f2a0398e613c398d2f9c9cf82a0d24f3c2d5787059295d4c13b081e58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to obscure the ultimate destination. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to download further payloads or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://atl-50.com/files/file/79498393782.pdf In PDF document text
    • https://ottopianos.nl/files/16366274977.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/xafoxanase.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/pajebigosipetobupakevu.pdfIn PDF document text
    • https://festacontinua.it/public/file/tarako.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa9215d258---vijewoziruwudikolix.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/52590600932.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/mefuduzamegiloribegi.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/xifaj.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40518676884.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/dijolafibe.pdfIn PDF document text
    • http://gnox.vn/upload/files/83466409545.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/83755385292.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lobisopefaveji.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614682922b86a---33567577093.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f273805049---gupuzafajejadafudev.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/58618308157.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210919120632.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3454b5187e7a7618c3d93e09ca5b1eaf/86670517641.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad70f2adb---detofaxutokiwezebexov.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210919092219.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/2897349297.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/zutolesazijowuzawakofa.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/15742306536137d0184a807.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/zofejunaxabutufibef.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090314013673499.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/2187486227.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/38523804409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+ball+tap+battle+hack+apkPDF 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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 16788 bytes
SHA-256: 8fc601c85ce277a5d734b3f245fa302efe487a6b369be698c7c61f643908f8cc
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 10628 bytes
SHA-256: 3536aa89cd48e8ef7ba0844d793f4d4dd334bffd201b5c652b2554e5886a6dc6
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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