Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd1b4eb76552087…

MALICIOUS

PDF

89.5 KB Created: 2021-09-06 17:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e18ae2d2eb4f3b9140f13b920b66576b SHA-1: 0391983066b9f405d4e137a45e3e85564a4053f3 SHA-256: 4fd1b4eb7655208756d11d8e6df4eb7a7d85b1328e27d148ad0d8a0f649db099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. The primary function appears to be directing users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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
  • 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://bawaniint.com/ckfinder/userfiles/files/48076609307.pdf In PDF document text
    • http://paliukenas.lt/i/File/98199432470.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/od4bjicmmqu891cji5fh2cg733/90376377596.pdfIn PDF document text
    • https://magatek.com/documents/file/70336129848.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609471b7d993e---76323565150.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/buxulim.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/37508320435.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/vimagani.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5641bf78d517cae7fb2f30bf0b48d34a/10093496707.pdfIn PDF document text
    • http://lucann.com/Upload/file/vavemisupo.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/resofafajotunavopepij.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf3ebc3f9f---16486843554.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202108191903295553.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/xogulidi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3312e1a432124a3a23a1b724ba52b1cd/95847889932.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f7f6979ec1859c5fa1112d3d62cddb09/86476572270.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/18346120250.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/vemurufojax.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/87bebe6a02085de090e5606ddc08b9cf/16290317308.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/77605860558.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mf60k53o9f32qmr4b1gkqevnj3/27964643715.pdfIn PDF document text
    • https://best-label.com/upload/files/zajolusibifurimapewugobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=livre+de+francais+5eme+ann%C3%A9e+primaire+algerie+pdfPDF 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_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 11056 bytes
SHA-256: 8ff302805fc68f907426b477c6cd843906c02c093cddebaad359a3b6122c398c
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 22132 bytes
SHA-256: 2ff0a91bd1def678034bcc99244e1b1d78de7c1c4d4008a521b5b584b3d764d4
font_02_sfnt_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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