Malicious PDF — malware analysis report

Static analysis result for SHA-256 e012a429c9d06643…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 08:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ba8856b4ddfb64d45a565ac4300b17a SHA-1: 3ef4b5df5bcbdbd6f10a748d02824836eb6ac46b SHA-256: e012a429c9d066432530466e5019e7f159b5fa175937f3e0e78244dc847d4c2e
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a social engineering lure, instructing the user to install a browser extension or update, which is a common method for delivering malware or stealing credentials. The document also contains numerous links to external PDFs hosted on various websites, some of which appear to be compromised.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dorfadvertising.com/ckfinder/userfiles/files/91748452481.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a26e37a72---pufunuzap.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea6756a2a---62473774295.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/fopuvorudunux.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/58618752779.pdfIn PDF document text
    • http://megalaserasia.com/upload///xabejov.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b48f339fa---pipezafik.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e2acfe26---49881173529.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/36897150283.pdfIn PDF document text
    • http://guitarenko.fr/img/files/69422388394.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613504ee77c2d---73534247919.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/23106358743.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcab632562---lojipodaxofojerusaveravop.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/86113980918.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/19494167706133d2b534b91.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/26287876662.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/kenilil.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/71273441276.pdfIn PDF document text
    • http://compsult.net/userfiles/file/zimavuxepukuvopupejegavix.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/tawire.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/kuruwuza.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2egtufr4j3evtrvujb0hkn3fea/13911446790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+block+site+on+android+chromePDF 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_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 10944 bytes
SHA-256: 81f6445bd73485a3d963ab996ea2584d1fc2feb16440ad9b4fbd675abf2db6d3
font_01_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 16780 bytes
SHA-256: 874d6d0ae65fbcd95ab1bf475b145e935e1e8216fb35aea37684c45911a8ae91
font_02_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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