Malicious PDF — malware analysis report

Static analysis result for SHA-256 996fd884fdd926af…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 05:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c99849d9d7a3c313d621b61029434f6f SHA-1: ab6fa52739825b5dd26fcc52dd30130c290bee20 SHA-256: 996fd884fdd926aff49af54589576653175f85c21417ba7ab1cf59ea98939dc6
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm pointing to various PDF files hosted on potentially compromised websites, and it explicitly lures the user towards installing remote-support tools. While no scripts were directly extracted, the nature of the link farm and the remote-support lure suggest an intent to facilitate unauthorized access or deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/su8d3hmee1089kobmhs043m892/60276216555.pdf In PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/32996059916.pdfIn PDF document text
    • http://soles2walk.cz/data/file/fujisofiluwerubupar.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091614302242.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/misovizolosibore.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31627543745.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/sevesezufigefomujutine.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902221514_776292989.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/xepewaxamexomekikofuvat.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/60361492794.pdfIn PDF document text
    • http://travellerisland.com/files/ponev.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/dinaparujafope.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b40842570770c2e927ec761fcfc668f9/5907835732.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/82529037011.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a08ede5dd---61636374689.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/koreroviketol.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133540b57ce9---9470115329.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613db913dab07---lumiwawa.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210913054654.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/pigote.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109071301431703.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/kokugora.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f239d6b65d08276d75fc1fc07082d5dc/53187675603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+screen+mirror+android+to+androidPDF 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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 18080 bytes
SHA-256: bf3fc31d02abb7800d05381eb78ecbf2fe3f868c18fba8a3cd9976bdc6e6f41c
font_01_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 10560 bytes
SHA-256: 7cf20add82ae826db8d209c326920c8c2fa32864aff345753ec52acba0735fec

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