Malicious PDF — malware analysis report

Static analysis result for SHA-256 f987f50dbbece59b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 21:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4f7e854e6397bd9667a17ef96edad3df SHA-1: e85beda0f304d1804d19e4324b3bc846ebcdd66f SHA-256: f987f50dbbece59bb4fe7437be01a5cec0b3cf9e105ea87d6730f9040cba8542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and Trojan activity. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous URLs and the heuristic findings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecoaga.com/documentos/file/vutas.pdf In PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/vujunosefinovelepugokodet.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/97vlkdkphrbobl74njme7k1esj/49939878490.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/lokazon.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/8109656370.pdfIn PDF document text
    • http://konberdbio.com/upload/files/xarawagojiwe.pdfIn PDF document text
    • https://proxus.nl/file/jurubaxorudowavejexa.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/47983943675.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1460c1da---66363836865.pdfIn PDF document text
    • http://mfahk.com/upload/files/31500407767.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/61188500481.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/lexilapi.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/kijojok.pdfIn PDF document text
    • http://iphysiology.ru/upload/xusupaxijexe.pdfIn PDF document text
    • https://khanikango.in/file/26622039862.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/25471459845.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d092479aeb89b6dcc028cf4cfb5075e9/xagowegurazesagubuzufeji.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/javinetazexibusosofi.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/menefusulozamolomabesoja.pdfIn PDF document text
    • http://davobio.com/upload/files/kifekuxojabadebawodimumi.pdfIn PDF document text
    • http://ccadl.com/files/20210913001855.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/pazodakerodazukomedozed.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/68652105227.pdfIn PDF document text
    • http://rapet.hu/files/6558991873.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/24333302477.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/59030285323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+desktop+live+wallpapersPDF 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_off0000b45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45B 14840 bytes
SHA-256: be5439baf09cd22fb8578957f40d0b02201644aa9c902a941fee9ea476d638b1
font_01_sfnt_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 10580 bytes
SHA-256: e656ce200f2bba5276e04e89f490ea2602aa8ccd0bfca43efc479a573a4273b1