Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c7d88d485973a6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 03:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef59f13ffd2ff6bcedd892a30506c0ff SHA-1: fe54a098dcefb931a33b56860c6f836240fbdc31 SHA-256: 71c7d88d485973a69b95e760ced84f7bf27365af67f5613e5ec915587d0a9da7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing an embedded JavaScript stream and a link farm pointing to various PDF files. Several heuristics indicate this is a link farm on disposable or compromised hosting, designed to redirect users to other malicious documents. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/21671345512.pdf In PDF document text
    • http://asiancfea.org/userfiles/file/24202256714.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/86386734752.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/2550580700.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/51624477813.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/rikoserek.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/89141936503.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/nafik.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210905174955.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/43994625193.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d16252a80d880ffdc53387500d2631d/72338442591.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135c20fc7e4e---65273282465.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/7332511665.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/kojogabubivej.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/gavibonaropesumorogurozuz.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210914_FE4DC7808FCAF0A1.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614042a26572d---taxedugadunipogu.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/wowujuwowene.pdfIn PDF document text
    • http://kccmaul.com/files/files/koxufaxexixavonuvu.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/xiruwujirara.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/40824198982.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/lavut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cricket+game+download+apk+offlinePDF 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_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 11004 bytes
SHA-256: 782ca93475c7b98c2a72cd96c9815075674f1915e2c28ffdf5d020f41cd82929
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 16920 bytes
SHA-256: c7a335f4583e6cbf217b6defd4b3df0286e7346e69e8264afd49bad223c3a8d2
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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