Malicious PDF — malware analysis report

Static analysis result for SHA-256 589a12daed75a4a8…

MALICIOUS

PDF

98.2 KB Created: 2021-08-08 10:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f2a54fb5ad9b9600ae0d7e1a52ec1a9 SHA-1: b8986f7933cb03cd1b6ff0182f837c0f5b036520 SHA-256: 589a12daed75a4a831aa1830ec44b0937382828c467d8808f83c3647a0d3d4a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of multiple links pointing to compromised CMS upload storage and disposable hosting, combined with a high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://brianhigbielaw.com/UserFiles/file/725578904.pdf In PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/97v7umofj5sualrd3he90vo1uo/91198923701.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/84764753609.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///nizabogox.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/97739244501.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/57299433715.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082235edf511---60887097076.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/91728707671.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/49367108152.pdfIn PDF document text
    • http://nensi.si/upload/file/71546435721.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/82739654294.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16779251006.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b20a39250---lunugunejibogojag.pdfIn PDF document text
    • http://riph.pl/userfiles/file/39917448854.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/rovoxiz.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3365296cc7c1ccdd8bd1a180ae22f181/kesopemonivib.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/71626225025.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/74005188455.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b838beab7---34939605354.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/63218586554.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/sizuxesetuwelemonotada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+an+annual+leave+applicationPDF 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_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BD 17668 bytes
SHA-256: 4246660b23e837b461f16cc00e2ce8b1115b39f088db24ac620d5ca7f8ad763a
font_02_sfnt_off000160fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FD 10444 bytes
SHA-256: c4c4d6c42c194a44044fdfed5f919a03f416f82b26d35e3393e0546f45e0a4da

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