Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65aeff5353c9573…

MALICIOUS

PDF

90.1 KB Created: 2021-09-17 05:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 791eb0e0d007367b04952fd551d66d4d SHA-1: 34dc36153edd6b7a95832a4df373603bad0b410c SHA-256: a65aeff5353c95737201ddad5030b9ad8d040cd1e9ebdc4d8e7863d4d9428d25
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's primary goal is social engineering, prompting the user to install a fake browser update or extension. The numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, likely serve as download locations for subsequent malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://coretry.ru/uplcv?utm_term=translate+page+to+english+chrome PDF link annotation
    • http://sola-brothers.com/userfiles/file/wegasodokadotawogoxuwul.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/givulokarofexusa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140973da9d76---17646983101.pdfIn PDF document text
    • http://agmapure.com/upload/files/lofanolakerijefidujisor.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020018245637.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/xozetaseguvovinoguta.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/30238065688.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/rurovowajaxixowefutukum.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16141d25848083---40204161179.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/9480716356.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109090501042440.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/lamenirowowunebeveladodo.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/pusopixetozat.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/96563348659.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/gadokofoxezedutiseruzisip.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/38900327627.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/nabakixifaneze.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3ebb58dcca17f26fc1eba39ac88629fc/76343922624.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/23353565862.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137583cc1a04---37244115346.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/kavofutafujebof.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/xosojigodexatek.pdfIn PDF document text
    • http://a-pluset.com/userfiles/mikoziwizifoso.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_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 18480 bytes
SHA-256: 08a0a3495d9243b79499fbea408bae6c7a0d4fe0692a6ae3102a43e6bb2fab3a
font_02_sfnt_off000141ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EA 10784 bytes
SHA-256: f2b5144cf9f44e61ea7ef036ffeb3e25a95d95c8b821ea0e4ba6981460c12680

Open this report in the interactive analyzer, or submit your own file for analysis.