Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b24dcaa32074f9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 15:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ad0dac6295cf85898e5d2c2d044c39e SHA-1: c0f97d6013401a3245b21af58c9e3b041cc4e9c8 SHA-256: 98b24dcaa32074f97b700a367b1b6ecfa27312844946cab9512521ea675760af
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple disposable domains and compromised CMS upload storage. The embedded URLs suggest an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://2winit.com/Files/files/13809491832.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410d7068f0f---27873054041.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/7738829950.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/bodudot.pdfIn PDF document text
    • http://koutingchina.com/upload/files/kadejobebuxirebegedu.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zibituti.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/72160232523.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/aa24577ff3d815edcb972d6c24ba9198/44943042944.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/40028313005.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c977c4cc24---lapujuziwebexi.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/zevedim.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/zunidunamimupifuzowon.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/16248217416.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/libemodunonepejo.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/lowigefevajodebajen.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/94943891623.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1b8b0cbe6---bekinolesumirinatadosime.pdfIn PDF document text
    • http://3sdent.com/upload/files/46226299023.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/zufuxugakikiboto.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630832693.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/dewejugolenasawi.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/ferimibigojewovud.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/dovup.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/gupififibut.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/28296065106.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/52989200897.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/55454031548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+kdrama+online+freePDF 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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 17844 bytes
SHA-256: 9a2a9850c17f792a626f49dedf56ae654b0cc513596c5d5c96fd79d73118c549
font_01_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 10656 bytes
SHA-256: fb8a9605b1ecacdee811fb4fedfccdf922287858b86abf6b495409f4b58d31a8
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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