Malicious PDF — malware analysis report

Static analysis result for SHA-256 743827ba4b656c77…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 09:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: caa30450ea79917b31a5e239d751b226 SHA-1: 36c554c506643c32a08a63363d68dd5debca6767 SHA-256: 743827ba4b656c7774bfa7ebb803bcb0b54448a997cd563ba360939455d14b4a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to link farms, many hosted on potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tradeweb.es/userfiles/file/lugidajekotefumosifuvane.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/72946809266.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/c82l9i7mskmnd2gakiagrfrfsd/ronede.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ok1ch43r2fulmuetve3bgm08q7/tinomowe.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/586f1d321e5346aacd45cb6d4e412484/getutamizuxas.pdfIn PDF document text
    • http://lovesenergy.com/file/25023163623.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/jewul.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5a1b614e603fec4c5105e9a6d3c40531/66601836052.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/anjksl7hi6o9qtittkuvnlgu5a/wozefuz.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160732dff5557c---30360714990.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22107802875.pdfIn PDF document text
    • http://dentistturkey.com/image/files/18485720148.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/rufugagipap.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/232468461612380d2b3884.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/finowofirorajodanipo.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/wiwakopipixeku.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vetizudikomov.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/vazatibowi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pk7bbm71916skbcodojnthv097/51127216972.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///mifowofox.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/xanifituteji.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/miduboxugabatedatideloxu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/31427790264.pdfIn PDF document text
    • http://yjccnc.com/upload/files/laperuruvefefi.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/27631850475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+to+word+adobe+free+downloadPDF 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_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 16664 bytes
SHA-256: ea3cc6a268980d177def41f04ca43571853b3e9402228dc11558af7680dc54df
font_01_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 10316 bytes
SHA-256: a6f4a8e4599b17743239a61d1d7e888debc6be0737f793e135011e01a842ce5c
font_02_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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