Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfcf30f9c1a2251…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 08:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 69a1f121969c2c60664e2a51730b6755 SHA-1: 93a9a5d088fd60faf1fe08b8b9953df485bc8e44 SHA-256: 0dfcf30f9c1a2251e42093427a133deae6e6cdcab56d3d2bddf9b85e9155e9f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://effektfilm.de/files/file/80247318890.pdf In PDF document text
    • https://ajitcoatings.com/uploads/xulonetijekemiro.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rujejenusixakef.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/sifowuz.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/sukofakotorobomotosegon.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1f027lhmn1tcs0894qj320tmh7/julorejerafuneze.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5b176ad0a90efd7d7cf190ef7337d181/78934571523.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/6376048303.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b2913fca2---43657675440.pdfIn PDF document text
    • http://fotossc.pl/_files/file/39400038692.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/12891417865.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/99548632069.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d10ec9500---vukepomixefedozuv.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/18i3i8u816hosq1iscasghaeq1/zevivowusojutudelirupinez.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/63310066471.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/57711076888.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f445d8f31d---dekedigijurajatud.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6b92fa347870430e3c0a7b4cef651577/43541561753.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/37627603788.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/95502368324.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/83747452444.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/41c12a0457419808ba9556632290cad9/9395147214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=douglas+self+audio+power+amplifier+design+pdfPDF 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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 10932 bytes
SHA-256: 91fdb9f1ba18ce562c5b9f8b3ffdab2800b68103603ed5ded738ca5c2d71d734
font_02_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 17188 bytes
SHA-256: 69e0e91ddf209e0badad89d0a0e52161676d8c15c7de6cb410fd027332d1f71c

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