Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5154a3fd966101…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 22:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa69f2301dd3cb7e0ac4f12a3a1d42c9 SHA-1: 3f8491a7f7adcf5b441447dd50ed0b0a975fcbec SHA-256: ca5154a3fd966101c45ef7eb881bd59ae0c6c4c07d299909ce5e3281e625ebe6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure to install a browser extension or update, a common social-engineering tactic. It also features a link farm pointing to compromised WordPress upload storage, suggesting it's part of a larger distribution network. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba192955a---46210971527.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318fd44e78f---61473554401.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/32528063080.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/56di8ic5gdd2te8aqq6oddgimk/58533187187.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/oqut6hefhl05l6ps2c3pe9hgds/gupunatirol.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/23194367090.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/deligaguze.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326fe665da0---vagewedifabuzo.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/50354661324.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4ff0083e3007b565539d4c75c992b326/zivajakugatakakinuko.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/donetunaxoladagabilotov.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161375c2385d31---wupixolujoxeju.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/39859704572.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/sasuw.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/pizenunomogek.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/48158628126.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/90970241825.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/rufunamadizokitimi.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/jezagawepozifejo.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/semuxejeworut.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/26105565498.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/xuzuxazavovibowibuwiza.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pominowosif.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/28498757417.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/t2ib5kcpjr5pm9nkbgctm10ks7/kixukizugevova.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/difujexowubelafifanegaxot.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/453b0ac39cd2c94a60089ed199494bd1/30834318800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=g9250+firmware+4+filesPDF 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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 10800 bytes
SHA-256: 0476d4fa11289772ca98a6c517a5f130eb3db3d02903f25ee0e86013e45675c5
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 18608 bytes
SHA-256: c9608197bb99aaa2b400766dd997c6737db87795a8c171ba8636dde1314329e6
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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