Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b182142249f396…

MALICIOUS

PDF

87.4 KB Created: 2021-09-21 06:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6021def8076a9686f0cec0645df7187c SHA-1: 0cdd4fc6c1b0b1d269ea8054d4d5530233f8eca2 SHA-256: a6b182142249f3968f55b30fea5db650ad108cc1bc9c3331d7c6827fc9540066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=free+wonder+woman+1984+full+movie+download PDF link annotation
    • https://0286869143.com/editor_images/files/33349324356.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/39088685991.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/sorezabitijadajima.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zetox.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/92496004612.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/gekojire.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/56121353014.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vjcems0m1702fffgp7uo980451/50587368421.pdfIn PDF document text
    • https://thietbigas.net/media/files/83527916079.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/fojomipobarakik.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/47606149557.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/91387348302.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/duwafodisogoxifopulotez.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/mojulozaxaxuxavuketo.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/xaxepimerekotusikedufajuj.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/nedifowivasujakezuviv.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/43105980463.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6103e9pbcrlu2alu68v6qub6b0/20424097888.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/53740476047.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/mobumofezo.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/180144311.pdfIn PDF document text
    • http://gysanya.com/upload/file/210902125845225623vd3fmdnjwk4c.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c91a25a1e---tudafovodenezi.pdfIn 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://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_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 10984 bytes
SHA-256: d8668d19ba92ef4993240e714c5d43601a23de6f381599e2f1753e81bb49b8cc
font_01_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 17220 bytes
SHA-256: 3ec008043cf55d16e5c1b9e5f88ac4eeea9d30f2bbf0dc432e22128d521e0034

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