Malicious PDF — malware analysis report

Static analysis result for SHA-256 465cb0392146639a…

MALICIOUS

PDF

66.9 KB Created: 2021-06-24 06:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c8e48baadaf75fdd5477f446f983edd6 SHA-1: 735315e4ec9f5f49bf9c0ac4a30c4a22f3c06b0f SHA-256: 465cb0392146639ae59820654fe07e851fe0ecf0a4d18c56d89e44bc887a7a89
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many hosted on compromised CMS uploads, and utilizes SEO techniques to appear legitimate. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest it's designed to lead the user to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b7a6c0be7e1ff0e6e01d5107b9413026/56572140693.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc8570d058---loxitipadulo.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/fesurozutezetiwuzo.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/2830905754.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/mamejadaxim.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cfc58137---37969511522.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893a2fe8a8e---julusuwanabokowowiw.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/dotojapawupopunexipeve.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cadcbc14b---suvewagapa.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fofeganizalo.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/vonaguwow.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/5res65v1pi78jk64dgi6uc1i53/99839077290.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vd3aulbabbvpbb070a4mlohm38/zopemiguzunixenagofo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951b146f084---46918282291.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/43356419982.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607684e00b607---poxavitaxize.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/jarinonufupav.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ca73b34d973---bapamejixiseduzegefunupu.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210621050955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=yuvraj+singh+book+the+test+of+my+life+pdf+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B6 5952 bytes
SHA-256: 6d3564283647651b4e76fd673f3c7cd86b9c181777bb8763e49c852fac9a95c1
font_01_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 10488 bytes
SHA-256: c39dfc153f9c154bd781c58468a09a78b7fe991514afbf7997c0a88ea432d619