Malicious PDF — malware analysis report

Static analysis result for SHA-256 1854b0a8164704f1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 09:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ad17d6949d040e712aaf29ac18599e9 SHA-1: 363b64389de801ca44dcd94c0bb16a053100c708 SHA-256: 1854b0a8164704f17ffb8d3155f045256049473cdee1e19f7b4a8fcd7b0830c0
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5c13e6ae---88823839158.pdf In PDF document text
    • https://limblength-sldf.com/userfiles/file/807918651.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/37209378100.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/juzidopilivagodakapejuzud.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160922725633f6---zanof.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/fuvonilorekosikal.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/dbf5997e583e9061e307ca0c7aad6597/gijiselegulex.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be9bfd214eb---91817442313.pdfIn PDF document text
    • https://robertbah.si/files/file/62291427662.pdfIn PDF document text
    • http://deltools.com/userfiles/file/betekove.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/mp27rtcnc5a4n2p3b8dl1l19id/70977546130.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c44f2ee8b75---40085819740.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a027ef2e0---wudamoxigimuxoguluxati.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/lewagiruw.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/tawekegimexosefodofekil.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210618_341E24B1570570E8.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912f7a6aec1---seporatewage.pdfIn PDF document text
    • http://lachina.cn/upload/file/kefidadudasipiro.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c52557e9691---rugojodububino.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/cf9370cfd660081e7505e70a152d05c4/zodutoratezewuxib.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/26483282511.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/82618701924.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/dso9i9cpnqd43u5v4hk7k7aunq/18495103930.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/senurudijabunezivagaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=le+carnet+du+mentalisme+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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 19420 bytes
SHA-256: 1be4d751c492098c93dd7b9be9f413d9846d79d90163ad9cc73728893793a234
font_01_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 10716 bytes
SHA-256: f850b95d088d64f4ef86af080247bc325154415eda247f810da4504e383b14b7

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