Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f377b0f3b54d01…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 23:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86c9a0fae8a0cbde20c72803c143772f SHA-1: 47f5e04a46960a8244041d10c24dad1933c27038 SHA-256: 50f377b0f3b54d0133710286ad31b21eab05d3dff4fa80c0305d609fb7dcce96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://synerhu.ru/uplcv?utm_term=picsart+for+windows+10+64+bit PDF link annotation
    • http://fotografiafrancescosomma.com/userfiles/files/91893696454.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/virep.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/40858113064.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/64474600023.pdfIn PDF document text
    • http://leguido.net/files/mutajeronefawipowuzed.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/85414625183.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/46821239214.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/15143195532.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/2402260914.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/91227243829.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/mogutetefubifafotezejaxas.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210912081147633.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/27011180197.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/79075662041.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/04a05c0aa48a1619d8b9cebdb7205b79/daguzologubimu.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/resulixu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d36d8b58---75392979715.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/lededuxilejagelegozas.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202191142383099.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135133d0c826---90528477205.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/bigukojibekegivuberuw.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/pakojulajilegedabuvaf.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cb1d7618---85607250453.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_off0000af85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF85 15812 bytes
SHA-256: c8e45dc064c4017406a0eab927f7dabb6b2b7a94dc5c8b364e4e7b79c2b89b47
font_01_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 10936 bytes
SHA-256: fe199b95c4c7b841c28b73404cbf9018df78c32f1d09cef4dc92eaa2b2c1e914
font_02_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1