Malicious PDF — malware analysis report

Static analysis result for SHA-256 4083de6994af9366…

MALICIOUS

PDF

110.7 KB Created: 2021-07-26 14:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af28da5308be1b439832391c1ba55edc SHA-1: e0a03bb55697b7fc764e7d746ab0c32a7970f24a SHA-256: 4083de6994af9366101dace86cbcf7f975d2289f3fdb7b8a7a9fca6a31848385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, aligning with T1059.007. The primary attack pattern involves luring users to malicious URLs, consistent with T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a24181d33a8---37851176692.pdf In PDF document text
    • http://aire-limpio.com/img/editor/file/74740997278.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/94595786419143283b7e4fea0c7dda84/latat.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/telixefojenokirosem.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rrnsjl6d2ogjmmkq6s85gs0107/77898199749.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/fexas.pdfIn PDF document text
    • https://andana.us/files/files/rekesivelokawivotifed.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e48035ec801e1a52146e59cf8e360463/ruzowuwigugepab.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d56a05d6226---sukilebutaf.pdfIn PDF document text
    • https://autoparkalbanese.it/file/56032446525.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1e616775a---57620533635.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/55862507476.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49981880216.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/25519734114.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/bivizekozug.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/3749b16118a9e4486bce5a14d5165528/4606352221.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f780714e47---lopaxe.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vupidadozagikofejitifuz.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pirixu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3c9396e3dfbe74df9f543724d293eb97/24780905049.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/45735690645.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad571f03ac5---52700206955.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160915392877c9---69101312462.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ledugekokiropozumese.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79a54a932---4162564149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=libros+anthony+robbins+gratis+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_off00014896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14896 19512 bytes
SHA-256: 08ce3ea78f451f6a40407ac8b238d8cab384d8690a3d90037e02e210b078d40b
font_01_sfnt_off00017ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE7 10808 bytes
SHA-256: d844bac7128c3a8a4677bec55fa58b2f63e7f0d0fcf27a3b4f252f3603f36437
font_02_sfnt_off0001935a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1935A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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