Malicious PDF — malware analysis report

Static analysis result for SHA-256 8316ae7ae91b55cc…

MALICIOUS

PDF

62.3 KB Created: 2021-06-11 07:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1683f88e54cf9c01881efc8abc6ce9e2 SHA-1: 053678386d2432f9cdc69ec74ddde28fa3f8c679 SHA-256: 8316ae7ae91b55cca0d25192bf6e5cd547352b5c41f974975cc3fa0f5f9c1255
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that aligns with the external URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=bailando+mp3+download+english+version PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12026c4021---defewakixubokowuzalubu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3e89aac17a7f1b9dbfb4e6844f43efc4/taziruja.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b487d33684e---63285085148.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/86649116813.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/tolarobasijaboralefor.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/defcd93291647c79d72f67064d588d50/xarumutafetonofitunu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/poxurat.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/41339f951e30fa8efd7b8f4e0b2e1a61/9264343259.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b7b40baa---15900414500.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50eea4621---2717618122.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210505000308.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc65b4067---740831436.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/1fee51637fc4b4e68538e7ad59e781e9/86809800717.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rh1g3eup34h1q8vfvi4kn0asp7/muwagosawosifodafofes.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074299678c80---24041425528.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/afbad938d53e5ad6d055a9e41814fef8/sidebukiputami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 5740 bytes
SHA-256: b387f08b499861c6125dfe863d5971dd1905b3cbaef0ad22901edf361b73764d
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 2116 bytes
SHA-256: 89454d8ece1be00d2333aac76955f46ed17c4d141322e635bf27f42efb43e54e

Open this report in the interactive analyzer, or submit your own file for analysis.