Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38ee97c83c9253c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 01:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91805aa54e2765717939866c08723dbc SHA-1: d0934ed31a7ab384cd8163c0b8829015c7c61749 SHA-256: e38ee97c83c9253cb6a5e04d9be07016f0a3ba390443f836230ebc96c6a6d7d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS uploads. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://open.ua/uploads/ckeditor/files/94082054774.pdf In PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/bezekajasotibadadasoro.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/29697148236.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/japego.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/86302928015.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/muduxares.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210905_A7D5187703E78897.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/25528141641.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/99776051016.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/63d41e4e3b2be29f3f3109c2c7177a21/rugapi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/23716725782.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/9055494905.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/151924548.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff7b3fa39---jesonij.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/26724742649.pdfIn PDF document text
    • http://goldmustang.ru/files/files/99053266784.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/nerapewaf.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/pagosubolevofaro.pdfIn PDF document text
    • https://fptica.ru/images/file/bulebozefadawovovus.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/kitek.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9fe9243d42ce205cc86f4002df03e983/nodagir.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b40842570770c2e927ec761fcfc668f9/5907835732.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/76402211447.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/69264781964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ludo+club+unlimited+cash+apkPDF 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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 17452 bytes
SHA-256: d9bf3e994ffd0ed08e8f35b69aa6b8871b5bff56cfab871690b8bc0526279dbb
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 10968 bytes
SHA-256: 6cd4bda12d75817e3edf1b971c35e2d33a84b4998d9753dc1997411c9a5d03fd

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