Malicious PDF — malware analysis report

Static analysis result for SHA-256 2704b227534a5ea4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 22:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0b6f7c4bb025103d01440fae58e7bac SHA-1: 29a1250b8387c81ed72d33f464eda01a2e3f47bb SHA-256: 2704b227534a5ea4394d09d1758d5d9790f270c43acd1118271fed79ac909be4
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a browser extension installation lure. The document body is heavily obfuscated, but the presence of embedded URLs and link farms suggests an attempt to redirect the user to malicious sites. No scripts were extracted, but the overall pattern points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/51717621591.pdf In PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/medutidorutonetawavoji.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/welifokuvozar.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/30092427525.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/9829001935.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/76944190779.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/26116641127.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/56447338677.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rltelaed69cvrbnpjf31gto3cq/87847464718.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/gagugopitadixaropapufat.pdfIn PDF document text
    • https://krusomying.com/data/file/nazokodilob.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/rebunifadubirabado.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/mijaviweketikuvo.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/zafiw.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/zisigarozitazis.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/97304743860.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/lamufaroxeja.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/40507667061.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/nasoguzetememasugesagow.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/97884687664.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xufij.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613388f77fe9d---rakenidajilabafubatu.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/gedebuligafikejizi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317667302c1---86299492323.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/kadetokiridemozuxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=move+to+ios+from+androidPDF 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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 10528 bytes
SHA-256: 9c4eb05b7d3417f383e1b25297af657c3d800c201800123b0055894b25df4008
font_02_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 17176 bytes
SHA-256: 1f966b8302f27725f57f372a2a20f60ff67c14d214e454d0aa4ac991011443ec

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