Malicious PDF — malware analysis report

Static analysis result for SHA-256 933300508087c333…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 18:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62ea84ec47a64b51aad5a30069f2ec06 SHA-1: 693fe2dd0bdb9587b2d18fdc51cfe2fc1c8bac60 SHA-256: 933300508087c333fbd0e0b31ede55e407926e4de257ca52658c5d4df5e077c5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document's structure as a link farm suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://crysiq.ru/uplcv?utm_term=morphemic+analysis+worksheet PDF link annotation
    • http://eros-arena-reutlingen.de/eros/userfiles/file/jodisakisifawitununede.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d5fe6bbf7a9f93ef1fba20e13d00e2cc/2674775305.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d41bef94cfa---sizagizebe.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/24228754345.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/956c6d6cd29419c0c4fcfdbf0116beac/86226728119.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jjavkt7gb7g62orbrsjn5au804/66625245561.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6d0vn15u9v9uo4gpvhsilhoq9m/wenipudututol.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aea73be62---5840792117.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/48795954455.pdfIn PDF document text
    • http://pasted-radio.de/web/files/41419411055.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/3823350032.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/69pk9vvjtgfp3nlvmjt2bqnmje/61558525467.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/56729132074.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/56141511893.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/xigulugupituna.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/pifozekojuz.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/32210852190.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/rigazateredakosoposafiz.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f78efc4---divewutawupesuzunovoxo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0c1b98169f19244c33a9d316ab7470ab/joruxaselebufifuvojafeg.pdfIn PDF document text
    • https://rjpexport.com/files/kuzopuligiwonuvudu.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c61cab3be---22506172862.pdfIn PDF document text
    • 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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 10924 bytes
SHA-256: ea7fe52868c8dab8e4c649227c2064dd4d411f96bdc0ca0c3736773ad03e6eb1
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 18952 bytes
SHA-256: a94432ea9d3bcf48f1d87fdc5c6102fecf23e78abc7f32ad51481911b9ca721d
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1