Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fa8916ef67436b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 22:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7eb9dc5b32e8e6db79c95dbdc0bbd0c SHA-1: e520edae1647e1529271903de915235c7b2f96ac SHA-256: 11fa8916ef67436b5255ec1611285b28f92733cc165ecac1d854c04e5d03b241
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier also flagged it with high confidence. The primary attack pattern observed is the use of a malicious document as an attachment in a phishing attempt, leading users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thebottombillion.com/business_school/uploads/file/sivuwinedosumimiv.pdf In PDF document text
    • http://eraldocomo.it/userfiles/files/tegolobedulivoworidor.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/povopavumuk.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/ronodesofopajuv.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9cde80736cb9edfae9f190872674261/46022862876.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/pijuw.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/73487958066.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145321d09650---51813525124.pdfIn PDF document text
    • https://digireg.cz/upload/64183499241.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/98745788705.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146e0d4bdf14---jujurej.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/fopexaxonefope.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/kalisowof.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/33708137175.pdfIn PDF document text
    • http://clingac.es/d/files/nukode.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fawilupoxavovomekodobaz.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/karuzaburow.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/33781285426.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210909_2699ADC90E27C263.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/60782165397.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wugupiv.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/gazunikidunen.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6f6964a9a702baa6b77e72d3cc0df053/suxesawazatefupuwu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/fabezirori.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/webalalotozadalomob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=car+hunters+unblockedPDF 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_off0000bdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBA 19504 bytes
SHA-256: 15873b2dc8d0c057cb9f926d2f5a9ff4c22310ca5b6655c2319134f76ef2dbc2
font_01_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 10736 bytes
SHA-256: 20da9693801fe0b2de8727fcd792ce11bbd5232136541ca9eee26235dec07e7b
font_02_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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