Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9c133ff4eb5bd6…

MALICIOUS

PDF

80.3 KB Created: 2021-08-19 11:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e114e7c394c8af4b5f5c7c0453124ae SHA-1: c8ae5e78ffc47f2bc1648df70a0c7f4880f69bc0 SHA-256: 4e9c133ff4eb5bd6b4158ad95a69b4f00c39aa4c64ff0bed90e7f18a99a3d7d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=what+does+irregular+plurals+mean PDF link annotation
    • https://daismene.it/file/kivobomamagoki.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/76627761990.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/kajuvowadijakorugubigawu.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kujafapiti.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e652099695---32324153223.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/xuvutebife.pdfIn PDF document text
    • http://qdjshg.com/files/file/poxanuduxureruzugip.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c025fcd3e87---46881502959.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vhccr4o80u1mt6dtoer1kevfp7/fafizitivutoko.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/69528172356.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/25565154045.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf3d96c128---70308140450.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beff60e89a0---42435041881.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/xufuwaxikun.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/3145422521.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/bekuranutogakapofonu.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/74058054206.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/xemozijulepasurixedon.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/43555916958.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2fff4c9fb---kokizorunogowogojos.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/faxaridigawujajepu.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/vilowirakowete.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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 16580 bytes
SHA-256: 6e933ae6ff11010d0754e5fd8a596da63e6e9b1744dc1d6c9c2a56caa25618b5
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 10932 bytes
SHA-256: ae04f0828e1215e5f2541514442e1b0ebe1f7bbc98a3c0ac31f9da28248df44b

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