Malicious PDF — malware analysis report

Static analysis result for SHA-256 5421bad4dccb84c1…

MALICIOUS

PDF

94.2 KB Created: 2021-09-03 07:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb578dba8b11a162949ddfccf0b87f16 SHA-1: 50ae0859963507f1823b52c1ac981d38358584a2 SHA-256: 5421bad4dccb84c1f95868f1e46d2e732a5b4be8801f13106d0be82e43cf650e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

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://crewmak.ru/uplcv?utm_term=pdf+reader+for+macbook+free PDF link annotation
    • https://binarbaidservices.com/public_html/userfiles/file/pikezoxatigomapumedetuvem.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/18563620867.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cf99f5c4c1ec80314df4af5ec55bf704/somutanatugelowurebib.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b22f118462dcbaaa8c655820b76acd0a/tigoradenapalaraw.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8fc03b34---jinolibuxisatuvanijurowep.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/14b06aa4bb3aea68970f9de51f20a5e1/94982528367.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ee3f3b21c17b82c7fdd3cd59bb111f44/6911024094.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/sasolowupenew.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65e7f5303d---pelubebebujelurikiwewo.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/54011318473.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9eb3000f0---serazasama.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/jumozekedifupelaxajopef.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/5156429240.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/c6qh4ooa4bqt4nlbrcd0aip986/87687507967.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/xitebuzoz.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/70165974159.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/pekazuz.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/58005631130.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/11bd09f696ec7d0d76497fca05c16f75/46959325296.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e4abfe29---61823050386.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612385f342e43---jofewanulijaf.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-8///20218291620266345.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/50121735293.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/446cc82a17afc0999f9ce447758cf499/mafidukoxut.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/6843378017.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c63cbcb5---45422451370.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16164 bytes
SHA-256: d7da5801168055627cb676c8436c5c866750233ea4b9482c0e601307330bf0b5
font_02_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 23200 bytes
SHA-256: 428da463aa8dd52a6cfa4afab493177cc884ee0d8247d4a06dd6abeffa1520f5
font_03_sfnt_off000149b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B9 10360 bytes
SHA-256: 6136b7f65f12fc5ca3d2c387b1b7a42aebfbed3bdfa35fddb49e815bb6377ab4
font_04_sfnt_off0001611f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611F 1924 bytes
SHA-256: b3c88c1e19850007cfb8aeb5473549a66b9fc136d23d75e8b3bd398b023e3081

Open this report in the interactive analyzer, or submit your own file for analysis.