Malicious PDF — malware analysis report

Static analysis result for SHA-256 381e9958c212ed0c…

MALICIOUS

PDF

82.8 KB Created: 2021-06-10 23:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d956d98df368a987677be9387880a13b SHA-1: 0b6975f2df2597d15de455c046c82e28f115d521 SHA-256: 381e9958c212ed0c948cae348181f0bc474081779b26ce23666192e2fe184f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The embedded URLs and the PDF structure itself are indicative of a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://chcial.ru/uplcv?utm_term=tagalog+movies+yts
    • http://worldofpacifiers.com/editor_uploads/system/files/81081134163.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb37c84aa---2962386743.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2a6d3ceb2bebc35fa5c2ad54dcad2100/92682354019.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ec81a4a530887deb759a1dfbc8b40d6a/14882572168.pdf
    • https://alate.org/admin/fckeditor/editorfile/79382403988.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608c916db3e0e---61433864567.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16094b92c910cf---taxunadezisudidunatamofig.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c109ca61cf70de365d75c2c1df9b5ad7/54235771643.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a26657a571---mepixuzusitekejigudenonig.pdf
    • http://asbu.net/uploads/FCK_files/file/mimuzomupajoweb.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a5acb1b95---zotosejujelofipoxipa.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7c2a8e14---zekiwopewosiwonanoto.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/26jj42206cdj3i7t4k1u5qm764/48825170365.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd826c619d---kinuwigibuvimobosedasome.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adacd12a5ee---32783173246.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d1.bin
8a9c1047ad750bbd485be3a4fd0c84a2c6c4831424a54742a2ce644550d17a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 5020 bytes
font_01_sfnt_off000103e8.bin
630d29299db9e6b80710b87b2fe32cdc3539e82848bfbed5395ed41f45cb9af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 11372 bytes
font_02_sfnt_off0001296d.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 16164 bytes

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