Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b4583b8fc26290…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 22:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5991063dc97c6c70b44a5fe6a3a7ac83 SHA-1: c7c509349a41c4077b61e253ddde39f83ec116ee SHA-256: 86b4583b8fc26290e30f17c5dff7cb67997c6b2f3213eeee24601d0123ee2649
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised or disposable domains. The presence of numerous links on potentially untrusted hosting suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.kingsmen-cmti.com/upload/files/kekedarusefif.pdf In PDF document text
    • https://senfina.top/uploads/files/wuzanuvezekolu.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/zosilufuzabivu.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/90040390360.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326c94d5d7b---24458340357.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/pavibivobozajimabasofiva.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/61886553298.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/girijinoxinulesuligejazuk.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/lofijem.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/29417678125.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ab95522dde64cd65f28e0b14f0d8526/77222532004.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/sozokebixepap.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/40446493702.pdfIn PDF document text
    • http://skene.es/userfiles/file/manizuxumozow.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161469dd1283b7---rubifeso.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/medetuvofe.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/49708942826.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6roarbeea6364hugp4usoq82d1/voruxuzevuv.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/58038692364.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/fazixapupokijomunewivunin.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/piwowivukarumawapalur.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/fufuraraduwe.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/zefina.pdfIn PDF document text
    • http://hflchw.com/upload/file/nolonekitogab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+notebook+app+for+android+tabletPDF 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_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 10776 bytes
SHA-256: 5a818d95b7fe8713d2eba5766a3869268b63da41fc21374de40bd3a2b7129dd7
font_01_sfnt_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 16780 bytes
SHA-256: bfa7dc36cc25c51ddcc7a0b41872e763970ebf2076cf9bc0c8994c95146c3438

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