Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04365b9f69648f5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 04:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f36d9e8664a32300ce020a3493243f8 SHA-1: d973a8255271b17e3183e884ceeb936b3d95b754 SHA-256: e04365b9f69648f56065eb59119b71a212e8325a6959e92309f969bec074a6aa
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which appear to be hosted on compromised or disposable infrastructure, suggesting a link farm or phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=blitz+pool+apk+download PDF link annotation
    • https://inprovitparaguay.com/ckfinder/userfiles/files/44232548087.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/zuzenodijovabisax.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b62e16a1b---logekijigorivimuluj.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/zanexapevitox.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/23731742647.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/xovekinerar.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/48660662132.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133caa9cc4d2---54910113297.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/kalegamisimoro.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa1ff108d---13423046618.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/susurovuz.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/belenexobowamex.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6db093645a4936b3e86d7159d1a368a0/69754953387.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090303445147.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/37311912012.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/23825632601.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///tifafobi.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/19947119279.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dokawokatirajajum.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/79639247484.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/9837256833.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/97967499106.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/41702031311.pdfIn PDF document text
    • http://tabletopad.com/images/file/boledalagakederipij.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/23813791380.pdfIn PDF document text
    • 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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 18700 bytes
SHA-256: 5066312be5ad584990aa89b3a0a7ccac766a4abbfa18c383f00d79d3d7491361
font_01_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 10276 bytes
SHA-256: f7580625cb8d3edbf9af96c6159fa3b59c6398a73afd7fa1b68fa3e7d5a21846

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