Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ef2fbd27463111…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 23:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e54ae6e46fba1c7cc3bc9f317297e2a8 SHA-1: 9e1837d0a4e01258f696527113fbafdf7d15842b SHA-256: b0ef2fbd2746311110990b4234b2ffbaada765682979961db200fa07a360ba94
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://china-glass-mosaic.com/userfiles/files/20210910_154624.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/692b0a180a356efb8a945dce3a791405/pesusoburetisemurixereki.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/60030341315.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/99771228294.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/5407267457.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/zutusimajikajiditinavota.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/54937375902.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/o8oh5c39r79nl5dmha5pavufsg/31075783724.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/salulugosu.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xagasaferi.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/disejaleropebomota.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/gakexusadevel.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/guwewigigir.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faf7aadbdd---rawabuju.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/golod.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/bofokexexafexolisu.pdfIn PDF document text
    • http://ipublicity.cz/data/file/92861870694.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d11838a979---35869061829.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134d986eea9e---nolajufugaku.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/28205329000.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/xapexaxuso.pdfIn PDF document text
    • https://ghnservizi.com/file/xubur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=live+tv+apk+listPDF 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_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10036 bytes
SHA-256: 0e13c7a3086841f370a7e607daa1a44653f8984c90f6c2e2472b384132183deb
font_02_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 17588 bytes
SHA-256: ed5f583d0cb8859f830641beb37734b8ab60c99de254c8f21bbcff63f4c73af8

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