Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0c21eb34c50303…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 22:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a74d0109807399cbf0c91e29d032f7c2 SHA-1: 992841bfe48b77407d65385b1e1a5b96a6909ae0 SHA-256: ef0c21eb34c5030396ce0f91c8f7e68f470be1bb7ff6dc9a9f5da6e10f750dbc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including a link farm pointing to compromised WordPress uploads and a lure to install browser extensions. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. While no scripts were extracted, the presence of embedded URLs and the social engineering lures suggest an attempt to trick the user into downloading a malicious payload or visiting a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://majortaylorride.info/images/uploaded/file/65049080779.pdf In PDF document text
    • http://nelly-design.ru/upload/files/zajavoresefiferukunamif.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/6156679980.pdfIn PDF document text
    • https://pcetravel.com/files/file/68108472567.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/lonotevamisubusu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/58023362429.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/4335448533.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/vujorefivujemugepu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/78761487958.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/tadunototuniwosorizukevi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/87417369272.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/lawelokilepadanogameri.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/bosefom.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f68178d6---pedugawaxijokuwemilorizu.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/90601493913.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/434408278.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/30695161163.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/fanutukuzevuxobilesokilip.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/95215578453.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/nozesumob.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8d6f484749deb0e305b8c8d4a4677b69/95015531642.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/bunikopibisabalikiguwef.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0d00b464b726f704e45f3bb34499fe15/52611771998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dark+reader+chrome+storePDF 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 10488 bytes
SHA-256: 2c060e627c6af4a190acc83a22c743707015787499cdb862d6d90fdc0b8fd06b
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 17464 bytes
SHA-256: ea7716ad30f290d86259a75f0817bc1cc2bcdb63ba648c1a88e93bcaca1d01fd

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