Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d9fa5f24534b5d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 07:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce7c6defb4c73444d00ea5a4eacb4b20 SHA-1: a8426d7b01e655f2e5f71843ff6468c8d7248f12 SHA-256: 53d9fa5f24534b5da0d83caa6f7f80aec64010ced2476ce5f04173cac6b725b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself, along with the 'wkhtmltopdf' authoring application, points towards a phishing or malware distribution lure, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=prescott+microbiology+pdf+download PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2e5mjo70b04l1h8v75ug9hlngn/zibajiwoguwopuwukovuja.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/xasisuwadufudifekozubuwi.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/bemob.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/jusatafimewozumuviriw.pdfIn PDF document text
    • https://lorus.rs/files/99052582116.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614420058ba3c---jugenakenuraba.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/xitugobikoziba.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/dobemilovevirogi.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/ropad.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/4484258991.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/14806022578.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/mepowebibogexuzuzimad.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/dubuzozukoxemagiseluw.pdfIn PDF document text
    • https://12shio1.com/contents/files/vewexosokuselegamexo.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/wemef.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/85385780447.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/zejiwefemujagiku.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/buduwegaweweratadomivir.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/37011212234.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/10299242153.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530ebee196---vagagedirisegitojovas.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/tedazuxakazomujixisone.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tabuzigadopasesav.pdfIn PDF document text
    • http://getem.eu/files/file/43372144894.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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 11304 bytes
SHA-256: 242dd7d287bf940e12a6d92dd3929547ffeef703d9848ff7b6e657d041b55928
font_02_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 17500 bytes
SHA-256: 35c30062efbf9820cf969bd42e2879a50d250c461d025e32e51881bd4ac54689

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