Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3d5ea00dc487f0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-12 20:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a1d2d58e8765d7c04bb732ad2958120 SHA-1: 9c3e93bc3b57fd4614282482780a2cf8ea362c41 SHA-256: cf3d5ea00dc487f0122573af2c23e82f4ce69a139c888d4d7249e4956602e20d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing malware or facilitating phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://endeligmandag.no/e-brev/data/div/62074340473.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/kgogr92nv7g6al1voccgrrgkne/85907732826.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/tetisofadoka.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/1569990690.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/49851856297.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ecdf3bdedd416271ff4e14a718d5a0f7/boxotasulogaroxudolenoje.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/gororuxagijaxosipakux.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/91602310246.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/lolabevivofofuripur.pdfIn PDF document text
    • http://kotolantopeni.cz/file/nirumatolimowadelapulu.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/29326692139.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/23996296525.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/bd5ecbc8ef4fbeaa046d88362de3fcdf/31720533179.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/73452520945.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7dc86582b---62131885692.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rnb4au0qlgfjuqac225nivgge6/20343365431.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/sivugijakevuleditanonixix.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea65b15fea---50349314768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=app+to+turn+off+internet+accessPDF 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_off0000c3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AC 10508 bytes
SHA-256: ff0652add4f98c927d29199e993d9f51bd47323dd663e778d58b63fcb9248590
font_01_sfnt_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 16992 bytes
SHA-256: ab6e9237093637384f89ceb3fafaacd5e589ad19d73fd360c0a0f8a452f14f12
font_02_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1