Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0ebba665603cbe…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 15:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9027f466891820ac565b6dd708715fe6 SHA-1: 83143eb658cd5777654b10758aa0634bae8a6c53 SHA-256: 0f0ebba665603cbe521572713fbfde80317c0e8bc38961f83b45182ee80a935e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pixomot.ru/uplcv?utm_term=estado+de+resultados+por+funcion+y+naturaleza+pdf PDF link annotation
    • https://dolphinsolutions.net/ckfinder/userfiles/files/79074353611.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/10436722561.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/84ae380ebd24a767dfc5e746c3833e94/72458245133.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/46679897800.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/46105648744.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8623d72352---wapimotefe.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/df2d78aee035b6a2f4c7cd9f16d0ca2c/livedopevane.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210905_5997174ECFF859F5.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/16677172341.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bae4780f2---gijogitize.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021082503544980554.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/65582898040.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/84271845611.pdfIn PDF document text
    • https://numberonerevolution.it/file/23643082935.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115458e5a561---57839061274.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/21285835659.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/44430185101.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc2d45f4a---39099625228.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/ziputirefezowapapogirapon.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9298fdc20c---tijusutajorer.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/98626111507.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882659391c8---fawumoxidopodolejogi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ea74f1ab50a60b6974eee697acabf57d/21105339543.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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 10868 bytes
SHA-256: c63596dedbfcf663f65ebbc2393196ba39f2f6c498202aa3c7270ba3ca17c63d
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 19420 bytes
SHA-256: 469f523ebf519d1fb4045fec1e838d05fca43a22f3068e3ed7e300a07dd0b0bb

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