Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de39927c08faf7d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-06 13:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4341b6442e551428f30a58c6d73b2920 SHA-1: 9821b3d1555e3c451d84c7930ad6e99b46d7506c SHA-256: 3de39927c08faf7d065e6cd2c5d0b652a91b94b9cd3834791a9da1a1c5be0218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning attack. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection. The presence of multiple links to potentially compromised WordPress sites and disposable domains supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://year-c.com/upload_fck/file/2021-9-4/20210904170627431920.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b489e1202c9---63604493781.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d3d2d36b---ximufi.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd41f0a437---30030674636.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210607095102.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/59123597651.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752845d419---17230137554.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/958169354.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0aa38661---wedigurufefobidiradepalap.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3f69ff389db45e4e69f63f4dfbd4e6c5/57930810547.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/37719524866.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/95392958675.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/832778221.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61143bf485---bobebodujeboxuwix.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/lesekuladorefaka.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/24612279011.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/48844508889.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a857e7dc4d8---1575488528.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210814_185247.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9091mqmrhe38qc6khkcror8f42/sebetifafidopigobobot.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/berikituwudud.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0e0e3a2b07e05d0e3531fca283cc343f/49482552484.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/tanexupifofawujuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=food+chains+and+food+webs+worksheet+answers+what%27s+for+dinnerPDF 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_off0000b8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 14972 bytes
SHA-256: 5f16c454c3abf24d6359856bae148424f23bef41f2c279030f56ed17ad64aba7
font_02_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 10856 bytes
SHA-256: 129ff90c21b5a366ba6fab424d8acf597fa3a24c207fc1ef2d124ad5fa8f8dda

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