Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fac41a44caeaab…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 02:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d8713c29183949b80b53d3fe2f1e5459 SHA-1: 449259267fa628ce74fc8ac8ec6ec80644561de0 SHA-256: d9fac41a44caeaab03c0d10d55a23398f1f3d9484ef1a1457ea676a18cf1e462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, disguised as a cheat code PDF for 'gta san andreas'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or deliver a second-stage payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/xefomedubaz.pdf In PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/sesedozeloletu.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/36069312012.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/zovuf.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2c6qph7qlntonm7umd73g4ihu6/79229046232.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607584d2120a4---riwin.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/wivomifovokemesiperopew.pdfIn PDF document text
    • https://pixel.bg/img/file/xodebenulo.pdfIn PDF document text
    • http://muszempilla.com/files/file/romuludatojelulugexokuj.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/duzazes.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/91d530cd7cd6d206d0bf78961f441061/jidowuwolunukoputesur.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609441b638954---41545833481.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/75840825622.pdfIn PDF document text
    • http://halaljones.com/uploads/files/dilegizexusi.pdfIn PDF document text
    • https://camphacement.vn/upload/files/tefakobafevowojireborerid.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9094659d---57552309047.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd3f99cc1351cde16113c54482a5931d/minudadepegu.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60128963822.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/puwinefidesutinifebij.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/31240309343.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5f008d293544338f75302d0750239629/31104107916.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eacc58bf1c---34682465024.pdfIn PDF document text
    • https://ewt.cz/res/file/91398310450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gta+san+andreas+cheat+code+pdfPDF 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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 17808 bytes
SHA-256: 7ed3b17baaed36ac4550ccd0c1f767d1b32b237961d8c7ceb795be6081727624
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10616 bytes
SHA-256: 9134d57b81cdfab707cf51360425316ebba6b1579ab16d0e8f6a1d7ba0922db7
font_02_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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