Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbadd6911ca7e86…

MALICIOUS

PDF

75.9 KB Created: 2021-06-10 12:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 70061d87040f4ae4f69e92f0d4e6a5da SHA-1: bf18c666297c5c6d00c945529777346a0f02dae7 SHA-256: fdbadd6911ca7e866cd38a3715032c89f83c542340426f3e9d2218f1e4612d4f
156 Risk Score

Malware Insights

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

The PDF document contains numerous URLs pointing to compromised websites, likely serving as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely acting as a lure for users searching for free music downloads. No scripts were extracted, but the presence of external URIs and the overall structure suggest a phishing attack.

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://philabc.ru/uplcv?utm_term=rihanna+love+on+the+brain+free+mp3+download PDF link annotation
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/3m6v07jlv7ad3atl0vuvn5p7r6/vulexufidori.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/9767128add8d9def9031a218ad00c622/tilebejinijidivasa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/h444p8bnif57rl77cv356gn4ks/94328356019.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/58958303565.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/91652280228.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7433bfcc---kubilepupebizes.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/13156996019.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mndg345u7d5dff7h7fiot7bd3d/lapenirizati.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/7a0uelf8lqko8s0aoh58u7hrmn/ralatuduloxuxun.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fadd5a7770---44602928115.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210608_133542.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/5215552854.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/8726eaa57d5b757b9b26316fa4fd7ff6/95212424222.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d8c11d5---81060037902.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/gufixiwuxutitomolabepa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/46834cb0c998dff85d4d11c34246db2b/mimiriderekalovepo.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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 5568 bytes
SHA-256: f132582d42e2110fa7ed25039178069c37e564504b8bd1cb8370e100017b6840
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 11788 bytes
SHA-256: 8aa3da0e845030307c5cb155f9a1cba3fec7b1c379b5dbd1e50f5c91b808016a