Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4dd549cb370c4e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 03:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e832af14cfbd350ebd99dc1459ad0ff2 SHA-1: 9ee77cddc27440438cd4cd3a125e8799c5d4c317 SHA-256: 0e4dd549cb370c4eea3d7d6ab855b72ab37a0cece06c23e0861fd7aa7cd43563
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates an active component likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kochitaxirental.com/ckfinder/userfiles/files/50798613309.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddc2fef5bc---nufulalanav.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/lofaziteliwid.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/19977345630.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/pemawedibosanelanuta.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f79cf3906---vasagifavasewika.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/fetukoxegafate.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/46044431460.pdfIn PDF document text
    • https://proxus.nl/file/47112529088.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dba6275e3---giriraxomorafakisobudapox.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/3249499632.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pemafodi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rosabasos.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/60832737930.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/fumitanorofevufewizeva.pdfIn PDF document text
    • https://shibbirs.com/media/files/60291867242.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/95096184641.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/16672097799.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143dcfb1796d---damazoverutinozafalij.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/berufanalen.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/ketinirivavuru.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/lapomuxepe.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jekowizirof.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/39931754379.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/17212896809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=first+android+mobile+companyPDF link annotation
    • 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_off0000b74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5D 17236 bytes
SHA-256: a3c8c6a5a250c93bba5997be7a1d4ac7e047c7cadf4b9993c62b7f3fd71e9bec
font_02_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 10908 bytes
SHA-256: 4ddff6f0f45c7b76a58f0254cc6ce5d28ea5533743631905d5e8529a6c2db8c8

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