Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc9939f3af3be32…

MALICIOUS

PDF

96.3 KB Created: 2021-08-07 07:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fc038b140b4d037b2773597c49a6d498 SHA-1: 92a889a7061729678b055d160f6dce2d62d2010c SHA-256: ebc9939f3af3be32beb666591029cd9de469b71c0a92a8fb5b4c94582bf9979f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://ms02bet.com/contents//files/xunaxisireluwux.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/05c50b0f45eba21a945bb990564cef03/misite.pdfIn PDF document text
    • https://bamor.org/userfiles/file/tivemiwatapamefizix.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/xikijadanujorufuraxedewip.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad7d82b22---kopam.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c2e3d0de5ad075e32b61ea32b196b568/wuvosadedolulavupedetol.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607430d0e0d9f---wasasewoniromuranimonenir.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pcs49vpd9s7bo27ujqqk4lji41/jodezuzudosumasewib.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cbe03280f257f9c5eee12ca3e300b93/21405382293.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/27584083157.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210618_6DCD3D1F2A10AF62.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/xemugerate.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/56391526153.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/437f0bb28a3daf9104c7f26162def865/bogogisigamewosasaxasos.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/sugasilafozurabejepijur.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xaxevukinizugiweto.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/panetuwewidepiloga.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/47291857577.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/8148185589.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/25780626333.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/o9aiqnbi7pndn76cd3r275p50p/65215651715.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9557a8a27---kuxofirofuxagofuzene.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/62497333918.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/depowerokegedejexor.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/49794758994.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/52241684657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mod+isaac+afterbirth+plusPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 18668 bytes
SHA-256: 30a584b0724189cec253417c8476830539299034f27c9b50bd47563475e46967
font_01_sfnt_off00012b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B13 10848 bytes
SHA-256: 4650fecea9d4561d9ed8e36f39d619e338ed2ab98c029ae552923cd2d6b57887
font_02_sfnt_off00014405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C16 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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