Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fce03c3cf6a60f…

MALICIOUS

PDF

89.1 KB Created: 2021-09-06 12:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdeec62f25fd33a31ebdfa05898f729c SHA-1: 4b15e95986ece99068a7404613c54db03625b4a7 SHA-256: 23fce03c3cf6a60ff0de27c2158fc4bb50d97f423778305d68a4582935ba0283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics indicate a link farm designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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://coretry.ru/uplcv?utm_term=resmed+airstart+10+clinician+manual PDF link annotation
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3sngd3dgtvjq3p3knkrhadb69/57263281195.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094031f6c525---fotuzupubeteveku.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/pusufukekixelalute.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/miwejavufom.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mvak95ramr5a4ebcgrbupvcse5/xepezatirexadotazolu.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/64130315477.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/disefoguparaviwivarutezir.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/sepun.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f12aa90d37---77023245706.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/fenafukifizilox.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/madorewuw.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d74b74cc48c---vavoduxaku.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/figadatad.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28346573086.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765dff3af55---66520594905.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/30893198395.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/zivakasupikorixomojapawo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e5c25924d55169df9bf604d0d8415f82/zurusujok.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613091555ff90---rajimalabifibowesoj.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/21901036055.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/sewoxademos.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/89789079982.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf2495e47---jonakekaniwitaxubezise.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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 18920 bytes
SHA-256: 31b9c9710d92214c8637b84ecc0d11aa97554308de64dd874ffa3889df3a0a80
font_01_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 10728 bytes
SHA-256: 4a6f683654bd6e69274543e32da80009daede6acd95b7743ad68552f7b1d22ec
font_02_sfnt_off00013e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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