Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd7caee458df78d…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 15:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9539505e04d852394728faed7d64448b SHA-1: a72ad8f8de9644287cfc937355bf6a732e1b047f SHA-256: cdd7caee458df78d0ffd28233245ad5cec654af7c549614bc0c383b731a5c60b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to phishing or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=does+lavender+grow+well+in+pots PDF link annotation
    • http://etenindex.nl/images/uploads/77590998446.pdfIn PDF document text
    • http://ruihuitax.com/files/file/29841846015.pdfIn PDF document text
    • https://network-italia.com/file/22668085527.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bf27fd81---71663690863.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/76973445237.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/losogigem.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/berikuxadidepolenuwala.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mv6ck7umoq7g3d90ca85bveu8u/regunesala.pdfIn PDF document text
    • https://semut73.com/contents/files/zokiz.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/kt89kktb80ql6lf54a2677gl4s/30992602123.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/47093391543.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/44904469699.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/xarubifaj.pdfIn PDF document text
    • http://youil.org/userData/board/file/regoxevibolipatejo.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/13943674813.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109201226322434.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/29105610346.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/foluv.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/66774127412.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tedizijawamunifemesugan.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/wixitaja.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/r2pamblruq5urqsg2g4ah8i4oj/54227500526.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/wisivig.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_off0000ae4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4E 15652 bytes
SHA-256: 3f3ed3caca958329e9fde7bef93c210e2805cccccd5d70e7b99ff4f00b822bd0
font_01_sfnt_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 10720 bytes
SHA-256: 7c158bb7e9c0872eb469d689ac1661ca3b534a4a4624801e15741a40da2155fe
font_02_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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