Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df1713e7b8c6f20…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 15:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 451cd5fda2956a1378cfa4d6bfe44aac SHA-1: c97e51ca9bd22dec741f36dc147622659f95ad92 SHA-256: 6df1713e7b8c6f20b263eb623eda4f9e8e6aea5ca5c689dd9068503733ce5685
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is a social-engineering tactic to prompt the user to install malicious software disguised as a browser update or extension. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://cructi.ru/uplcv?utm_term=sincronizzare+due+dispositivi+android PDF link annotation
    • http://clarksville.net/wysiwygfiles/file/tetelojedivevi.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109081802564485.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/87082233025.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/39331486200.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/78425301785.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/xivolob.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/turuki.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/puvelete.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fe0d8e1366954bec456ebc5d04219a0b/58451666640.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed0065deb2---xulusolifaminofugas.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/vipubul.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/pofirizadanekisegos.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210908_150034.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/69434976988.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4675769f926be3d7a4a0f4685ff1f25b/dinemodizafi.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/911269774.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/negutozugawetepinajas.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/domirogu.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/26363401461.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/17295884559.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/tobexagot.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/48202050512.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/15011245536.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/zezam.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_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 10760 bytes
SHA-256: 46375f1346fffb8e38517945bbdfedce4e275af1f297d973b25e3a171393f8c8
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 17608 bytes
SHA-256: f26f8e14fd58c54c54f35e79642acc4969d28d385a68f804022fe10db4c532f1

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