Malicious PDF — malware analysis report

Static analysis result for SHA-256 df373ce3fb339bdb…

MALICIOUS

PDF

113.7 KB Created: 2021-07-18 10:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6758d4b97421fdd4223d37eb577511de SHA-1: 69af3f592e5a5267812a0168f5f6f8d7d191b6c2 SHA-256: df373ce3fb339bdbfb03588b2d147aad72322a16f86006bc57873608fe6dd823
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to potentially malicious external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ebbf8b9---58191367154.pdf In PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/8181029446.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/30217807196.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/kukimomulavamalozijalo.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/xixunonazutibigixaf.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/gizapedifigomerabuxo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e278bad98---kusoritosag.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nupukonivutumajes.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/5676f07f55fbb554f95c3c6558cae323/66045885510.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/wipexajupawoda.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/866b751db324c021f033d11f24aa8ad4/mutiv.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/57180361071.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/nusavoludofuk.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f9d8b259ed8761c69a68e350b98eaa84/subulamuzakike.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609733484fd2b---64949130377.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608285660441f---45904273188.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8e83e4cb912c52b5ab71e38d2318b07d/jofemexedujar.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/35f617e7e54879103317887fe4c5c2f0/18803233369.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16083041c36ff8---vefasivegadamodosusarare.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ic7g90uefj48qills2i2oijk37/sigupajevafabuz.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/560195cba14f2c6cd4666baafdf427ab/dujuwix.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146069261c---9008991788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=alcohol+hoarse+voicePDF 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_off00015aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000172b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172B3 18696 bytes
SHA-256: 3c80824e4687db27bfe25bc456ad0795ff2f304e98b617e814d8deca68d2dcad
font_02_sfnt_off0001a2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2F5 10172 bytes
SHA-256: 64f71357b3c2663bfdf9cac02b9368f8d39758d8efd6c4488e666e7e96ab5aab

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