Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3227278cac43f64…

MALICIOUS

PDF

99.6 KB Created: 2021-08-10 00:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e0490907a27b2f3a12005e71c321853 SHA-1: 9d411587b9444015c35126520764bae9b70a4f2b SHA-256: f3227278cac43f649a2ae7ba2bcfebaa195cfdf854a3a9ecd0058ff420e2fc37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting domains, likely serving as a distribution point for further malicious content. The presence of numerous external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://vigova.vn/Images_upload/files/73039051855.pdf In PDF document text
    • https://bruceautoservice.com/files/file/3437845582.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef78b8567f---26544794662.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/663de5c4699fc5cdab404736121c879b/79492904363.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/povesaxixepasanuwe.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/44377048770.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/tek3e25bpqi68tmf8438pa0993/660994503.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/katarufabetine.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/31266528109.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d208697ca4c---56072084496.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/j8d4ghde3hotiq9f6bnkn0efhs/pomifelijumizov.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/28924817686.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/85431731320.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/60177712536.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/34563864082.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/78116265513.pdfIn PDF document text
    • https://btegypt.com/file/lopapisejigekibedatakatu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1865a1b67---bofuwulezafebizite.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0e1574acda2b28b42c0aa25ae54c56fa/jatuzosuxigox.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2dd6bf271---70037599300.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c68fe3b9fd2---29604591377.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad415747c---taxesitozig.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/siwudatejuv.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdea89e67a---53666949383.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf375d936---zaliduwipirid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bible+study+journal+pdfPDF 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_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 11028 bytes
SHA-256: 527fc2c71480b1c35b73c0996e6d2e348c41246624adccfdda8f2d2b94e8a5fc
font_01_sfnt_off000137de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF0 18284 bytes
SHA-256: 1f3f0b0d91875182f3931330c439fd3f950ec3c4fe684b88484fa1c67de56c15

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