Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90b14b76a13d488…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 15:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2929c3dd37fcf1ad635acf57a9cbe2fb SHA-1: 78c2c47d656732aa8529cab0db66f07d5ecfcc74 SHA-256: d90b14b76a13d488d1672ae418eb5faad5a9167f4cbca5eaa447a9a97ee54512
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://abwessex.com/uploads/files/zitabuwozefikenixat.pdf In PDF document text
    • http://kietminhrivet.com/upload/files/votalisasevidesu.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/48145754095.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/58ee6165687b8ea55a519c20b2865f22/97506991204.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16103ac1262658---18539235355.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5da8a1c85---52753226112.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/95bce8f2cd5306e12e39858ddac52872/28581200070.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/jutulatisifufibomebus.pdfIn PDF document text
    • https://magerp.org/upload/files/16197225933.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/daniniz.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db83e5c5b24---ziladudopuwalusu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc31a4c9b7---23602413218.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/38556604017.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/malikadufakasi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/79805023426.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5f1a9db5---26246282320.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/bemiwumaburazop.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1310d37c7---dakus.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa289c79f2---xumufokumowumuzavum.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kebijuwo.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/37622327399.pdfIn PDF document text
    • http://ahhsclassof1980reunion.com/clients/e/eb/eb0bda5e83c72ae03ef0bdd1ae4752ba/File/sulal.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/widurodenusujomebipeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ansys+finite+element+analysis+tutorial+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_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 10856 bytes
SHA-256: c23c33656bed3cbab38cec1de57173f8590af6fbf89bed7e2baf2463291b8ed5
font_01_sfnt_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 17568 bytes
SHA-256: 99ddb6baa2e5d48207c8109c61e9151d72ca3fec596c632aa11dd4af2f903687
font_02_sfnt_off0001417a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1