Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2d25f80f2d49c1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 06:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 878905cde2b4d2b4fd3d90fc03f7f03a SHA-1: 5ed97cabed14c2a649cf1107f0ce0c2ded5ba73e SHA-256: 4e2d25f80f2d49c18c3387fba4b474a5ed8ad9427d66877dd0f490cc4095115e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://brmhn.com/userfiles/file/20210914022300_a7cjxg.pdf In PDF document text
    • https://dom4m.com/userfiles/files/sipor.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61695176544.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/gowukegafonezoweg.pdfIn PDF document text
    • http://kodemari.info/data/files/gewinuvel.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cui3005fad8qbm0vkl3sqa3957/93662432733.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/3179667384.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/papeduwubi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9450cb231---jewezebox.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/95557412858.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/8741728844.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/muvopevijoziroxeturegijad.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/62793757802.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fuwevufakawelu.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210902063032.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zumotobefi.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109111505232663.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/zozofijaxome.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/lizamovujonoduxitok.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/kazizasitito.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d1db5d3c---nubepanuxurap.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/fezulagodi.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/gosobobaxuxotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mirror+android+screen+to+chromecastPDF 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_off0000cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 10580 bytes
SHA-256: c5a6d98942808336541f4238c7f2805babf2a00d772b79f98060ebe569f6de85
font_01_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 17420 bytes
SHA-256: 06ba9955bf9777713e6e994240e6569ce77abecb6b0d48f8c11917297b4e1710
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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