Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8a9326078bce09…

MALICIOUS

PDF

105.2 KB Created: 2021-09-22 23:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9085f8c88776a0399c73b4cf9eca4d76 SHA-1: 0a69936e6d41b7828340bd884075f12a81b85efd SHA-256: 8b8a9326078bce0911e16aaf6c54ea5a738626067bb6f5910faf02abb959c9ee
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=giovanni+papini+gog+pdf PDF link annotation
    • http://ck-kutnahora.cz/gais/image/file/kogisoj.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/35223356283.pdfIn PDF document text
    • http://ridendo.cz/files/file/juwod.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/riwapojuzekolomuruxeloto.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/15387216569.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/jefox.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131086ccc9b1---68251641274.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16146d5f1868ac---35300036965.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149aa3b120ef---24040702226.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/88696077487.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/tk4helqnf1mkvmq42opg3k5edp/35886005804.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/64202798536.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/84313137656.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/gavukubibekevulopefegubir.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7a8a9dec---59937899485.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144086c54936---44528509037.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/lekupixajebibofobakolapef.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0dede65b9d324de7fcc186958cf6ea70/10211704605.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xetejaziwozumajaruv.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/s9992et88dstj78vk6r29fssgs/karuzuropefimuf.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/60759471645.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://ebd.su/UFD/7623/files/javuzunexu.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/52282826798.pdfIn PDF document text
    • http://laduses.nl/image/file/52802704007.pdfIn PDF document text
    • 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_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 19184 bytes
SHA-256: ddd235249525c18c8550078e6319221b38d316526b472e2a46e3610ac513f859
font_01_sfnt_off000166ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166ED 10236 bytes
SHA-256: 40ef979aa2381b64e89d2749d0c81d4bc75d4b2a319884764b3abc77809fd9fc
font_02_sfnt_off00017dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1