Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb0de18be5a36c1…

MALICIOUS

PDF

96.6 KB Created: 2021-09-08 02:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 576e5cbcc6daab739036ab9f59c89e12 SHA-1: 21a334da0bba15469b17b68e8d0e5226cf332e9c SHA-256: 4cb0de18be5a36c162ba49237c677e9b73704b22667770198bc719e3e6cece54
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the structure of the PDF suggest it's part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=create+a+worksheet+title+in+excel PDF link annotation
    • http://agcslohian.com/userfiles/file/mogajasunijeresejijo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/375bec7234291dc2d732fccd0fdfd41f/85286664241.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/75ltoatku0mav56uov3j932as3/neriguzerupozon.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/90170147250.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076310aa47d7---kamapurides.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/62963974705.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e07006fc4---29161505939.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/lexubupemeku.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210626063428.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd4a091261---nikofi.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/96043959431.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f6315d349---runolubipomizomawadalijo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/bdb5819a547bd88305559a7cbdf0db96/misaselisunizo.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/85095274674.pdfIn PDF document text
    • http://dzbnf.com/upload/file///48381211999.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/zobepoz.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/20603455346.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/99453715177.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/xevome.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/42222923090.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077673b9b210---bufuzojom.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_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 10636 bytes
SHA-256: 50a377df6bc379ff07ed3bb3fddeea2f8e7a8191e57c5e731642efcd45535532
font_01_sfnt_off00012e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001468f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468F 17780 bytes
SHA-256: 28fe08ff1a35c6acbe44232dbf7aeed3010ce89bab4e5f2ff205eda1c25046b2

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