Malicious PDF — malware analysis report

Static analysis result for SHA-256 6099b25e661f22e1…

MALICIOUS

PDF

79.2 KB Created: 2021-08-28 05:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47d7f91a875c12269d30089861eb288f SHA-1: 8d247adb4080e5daf462e6e35fdba2a5b1ed4994 SHA-256: 6099b25e661f22e1320858fc1b4a88f2cf313eaf67d00adea7a54aee82a609cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as a phishing trojan, and ML classification strongly supports maliciousness. The structure suggests an attempt to lure users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://chcial.ru/uplcv?utm_term=use+overtime+for+bruh+graph
    • http://qunjl.com/userfiles/files/48563360793.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b00ed255---74910927406.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/gazalizuvodaxodusu.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a46fe8862dd---zatuwakidefovir.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/124qchp4as274s41phflc9ug16/35180205468.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160845656c6ecf---nabepitijeropokoj.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081808539213---33063046467.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92951519ec---3230288748.pdf
    • https://jensbrode.de/files/file/50412480538.pdf
    • https://houstoncoinclub.org/FCKeditor/file/63585433847.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e82bcde643f---98268744326.pdf
    • http://efuturesthai.com/uploads/file/76363874101.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849f3c5bc18---76476592555.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4fef46v39efidelqbt2f8deai2/65455637633.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160961aa449032---36477897170.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/g15pef583cdajv16qu1k7t4vh1/31717103848.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/sodawe.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3eb54a721c3302f5498334a2ff466b28/5276070025.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f1782a3c---10615104038.pdf
    • http://pinedafoundation.org/imageuploads/file/1537875557.pdf
    • http://malifer.hu/upload/file/30342207590.pdf
    • http://tortsurprise.ru/upload/redactor/files/zorixoboz.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/970661a691c2b7702c2b98958f9f17f8/zuloxo.pdf
    • http://clearspace-design.com/CKEdit/upload/files/389098346.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07e.bin
4130def7a5e24b6cb03ffdb2244e72fa04f74a80ac855d3e1845ced3a17de21a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 10968 bytes
font_01_sfnt_off0000e9cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 16792 bytes
font_02_sfnt_off000101e1.bin
2bbb0ca6fc6c5f2815157064dcde6e1ec34993426d997a0f46467ff4d31a5861
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 17260 bytes