Malicious PDF — malware analysis report

Static analysis result for SHA-256 f619dadf6ea0647e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 10:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63ab9cb41498344a7d7d3061715667ca SHA-1: da1b92b9169f4bfd4a4e3ecabcea65766865b949 SHA-256: f619dadf6ea0647e9993febbe3fbb81fda5c997311ba90aa3878612b90e4dac5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing/malware. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for malicious PDF execution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://manchetenewsms.com.br/ckfinder/userfiles/files/51632494336.pdf In PDF document text
    • https://marugame.hk/editor_upload/file/vuzagijorawetipije.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/68078551054.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9d9288904b81ec322c7ab41b7f0f2990/99818949228.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631465743.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/filomuwupapiwo.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/tijumevifigilirokupuvesa.pdfIn PDF document text
    • http://dnepropress.net/files/file/42551587712.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613957419efd5---subilonafeviwuzebokijen.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f86a6e918---supobanunifevavedef.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/sakivazeb.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/woluseruzifeduxiza.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/ruvipi.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/xobimadizaminelunonudile.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelaja.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/desoki.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/29296417699.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/nagavaluxarijadosolofo.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/zipesalisosokife.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/nedanitodof.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/8639733816.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/83048674301.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/madize.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/gapomosunibelunibutesun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+disable+incognito+mode+androidPDF 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_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 10932 bytes
SHA-256: 6ac7898b359cf8028b0ac9ae7fce922763bc9a44394ccd311a455270d0ee4855
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 18404 bytes
SHA-256: 553323a7b5bff015e1d529ca60ebb679d9c8ba4253ec3aade1e22629f8bde536
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1