Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3807c7067f023f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-11 23:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78d5bec57a3d5c56497a8b64bed5441c SHA-1: 5261c396d3a717115ce406564a87bd820767ab6a SHA-256: dd3807c7067f023f3d9ad80b929f97cc7da8389180447c8c844e90790780b81f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external resources, some of which are hosted on compromised CMS upload storage. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's intent to trick users into downloading password-protected archives, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cokhitienvuong.com/uploads/files/20508614247.pdf In PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/fefasonunalidosobavipur.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/lidog.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/80556167906.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/dewukesuzu.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/17532762546.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/90735912935.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/jokozavukawisite.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/wawexakesuzamesorupaxilu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131696bb919d---75902417907.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/16231912740.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/monerosuzarakuri.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613744f4a2517---92850232751.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/derakexexofodoki.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/24068977513.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/16765846682.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/66118579746.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/3816001400.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/31699621057.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae0e239a9---xalaxuvonujekonazewugiz.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/66848054400.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/piditegavelokosid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=super+mario+maker+ds+rom+downloadPDF 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_off0000bf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF20 10808 bytes
SHA-256: 6d2565bce4d2389f3a81dfd81e2d904906f0b7a884aaaaf2b23792ac76d89fe3
font_01_sfnt_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 17108 bytes
SHA-256: afcaaf2bf894f01778911a589bdc5d0d1672c541858d3e6eb9b19fb850607508

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