Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb166527bea4dd8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 14:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bff4c98985be4a5aed0605df5ed08e8 SHA-1: de8c58993699fb57efd435fc39e01085f6672388 SHA-256: 3eb166527bea4dd837e7aa5e8772ad0508dfd827eed5ca1e08c3d929f826c655
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into downloading and installing malicious software by posing as a necessary browser update or extension. While no scripts were explicitly extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms, indicates a potential for downloading further payloads or redirecting to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=running+android+app+on+linux PDF link annotation
    • http://captaincook.hu/userfiles/file/98715959612.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/roniva.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210901053024.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210902_1DD8E005304395C3.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143951fa3bf2---newuzutesaxapudupemetij.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256dde06a8---5001202663.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f1ae1dce233ad27fb910a838c861db82/31911803046.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/jexaxebixuzupinawivazi.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/69089930139.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/pefuku.pdfIn PDF document text
    • http://topp.pl/_topp/file/lowijegusaxonosekoze.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/8622814674.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/35699548723.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/wujatobovipujasenek.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/tifizuzataxizikagamixuved.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109042009384638.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/67724489947.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf3100c3d---rifupujovodumozaw.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/17277159596.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/87503940555.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/masak.pdfIn PDF document text
    • http://topstec.com/d/files/neforidonujud.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/migelibageme.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/kukegibedan.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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 10416 bytes
SHA-256: 4725a194b2d73750b7bebdd02eafeff76258534d760ae355ec43e18daf7f9312
font_02_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 18872 bytes
SHA-256: a968a81d0c80258f43220b15add6c5095223ed35d0c644c0efe5dd328dda855c

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