Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7a1e418b4df598…

MALICIOUS

PDF

75.2 KB Created: 2021-06-11 21:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e8a22b2995ca608823f9debad62eeaf SHA-1: c9857a72c0a29bb97dac35cfbfc65e72f8a4e578 SHA-256: bd7a1e418b4df598661b9f522d579602e57d0ff1025f88fb1121798144bd7200
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to multiple compromised WordPress sites and disposable domains, likely serving as a lure for users searching for specific software like 'Hotstar apk 2020'. No scripts were extracted, but the presence of numerous external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=hotstar+apk+2020 PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7358d95606eab140e90e49218fa19ec7/bobanixofofut.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d4c7254c35c2692196860eef613d5108/69958686809.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/32031489218.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/uadat4n08be1csk6nsvp7mmte7/lidujudubapo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a1d6331d---gisox.pdfIn PDF document text
    • http://fygl.net/uploads/file/222057026241.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3b174bdf8943626f67b95ef104d30802/jusumarugebow.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/3738121158.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/afni6iell45n63sajs81vks3ki/lexodibiluz.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bcf16688---fafunizezomodavabo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/50449350f822d7573dcd443c14e879b8/41557546093.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a122cb22ca---zefajakafamaxiganepogot.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/nelaxefuvebigoralipanov.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff339722b50124cdfd1edf7c1af8ffa6/56218543957.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/l4hemf7m35gfr6bub63aep7c34/13395873243.pdfIn PDF document text
    • http://debden.org/userfiles/file/8995103284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 5080 bytes
SHA-256: fc9dd7d47f00ec87fc3964b58169de5372c2c8f7d1bb27c40251eddd66e5619c
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 20180 bytes
SHA-256: 2d7950e60b55cfaa2fa063146f45c19a4cda5b5599bffe9bf40425302f1b6b1f