Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9a0fc2d8364c77…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 05:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9be896e2a7126787121c1eaa4adfc68 SHA-1: b9c8d3fbbea0e0244ee58764afe6038d83c3862c SHA-256: ed9a0fc2d8364c77218ac2348dc99f380d6834e9f8d002950fef5eddfa3541b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1ead9966---vufax.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/lobopi.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/41294650441.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/malisimozilo.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/50614695473.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/52155137217.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/28599894948.pdfIn PDF document text
    • http://labotinnghia.com/img/files/fagapulobefopupowubozalu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b84c35591a---soxofigabezove.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/kuloled.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/989379087.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/22572994746.pdfIn PDF document text
    • http://budropol.de/Upload/file/sokiraviwonejogo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f353c7343---38067296515.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/safafematolexogawaw.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/wupizaxuluzutipaz.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/fosonixabo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f951adf64---mamitatuwufekefodaloguk.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/93096087096.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///59557029333.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/29641056059.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/wotale.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/2484801102.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/meroxuwejuwutasesaxuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=game+psp+basara+2+heroesPDF 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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 10476 bytes
SHA-256: f933bcaeba4e844d85a9d2fb8943abf15f672a871646858446da6f84a76fde69
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 17068 bytes
SHA-256: 2f8ff19be7c232b85fe9e060bc064c50dc964a5f0b233ded12b339373dd9b7c2

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