Malicious PDF — malware analysis report

Static analysis result for SHA-256 91338d4f27aa0f13…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 08:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e68c63c0fbe89294dd2b1cf1f4432c6d SHA-1: a9e7d7f342a152177497b09bacfb0a314d81c5d8 SHA-256: 91338d4f27aa0f1376ab579d8611f1d3a4adb29858e4892b9bbdc5e8ddea6181
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded JavaScript indicates potential for further malicious actions, such as redirecting users to malicious sites or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://talani.nl/userfiles/image/file/ledudano.pdf In PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/kefiwafipozakijiduwowox.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/32015721408.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/74b8d4b804070d84fc8b4def2d615e38/zotituliboput.pdfIn PDF document text
    • https://angkalaris.com/contents//files/20097449861.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/nawopubev.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4fe5c9db760a47b4699f0581710d8743/lisagoxataba.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612c17b8228b6---96729978934.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106281403324354.pdfIn PDF document text
    • https://bczenekar.hu/files/file/xafojevinajusedefe.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/75342314242.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/vanoxanudodo.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/50035072198.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/75057097720.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d2aab261---34298794543.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/nizipuzetasopewimo.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/54085168449.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/22541702024.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132ddeb967a1---34110045801.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/82876875202.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/ropewuzekabiboropak.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dkfb4csoitlkj9altf4iij7ta0/nitezane.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/135974c2fb06818564a8f3f9ddbf89df/95291121539.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/xotuvatekop.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a570a42608e---38675262054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=starting+strength+3rd+pdf+downloadPDF 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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 17480 bytes
SHA-256: d21986813224917fe03a814e604583b4ba0033c2733732150b229785b35ed11d
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 11108 bytes
SHA-256: 70c23ce680b39d5bc3faafb4784a922e964f78a0ed0f4b200acdce9314ccd189

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