Malicious PDF — malware analysis report

Static analysis result for SHA-256 493bf396d2b9b966…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 17:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77a9b713227a9d381109abb4687e2596 SHA-1: 7d3c08a1e86e4f0bbe19c4f9df4e6244046e6fb3 SHA-256: 493bf396d2b9b9668450b7ddc45c43cccecf9a0c209d13784dd488ff9236095d
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to compromised WordPress sites, and employs a social-engineering lure to trick users into installing browser extensions or updates. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggests it is designed to facilitate the download and execution of further malicious content, potentially via JavaScript exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=english+language+for+beginners+worksheets PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f540d1df5---wemejagulamigula.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3fd4041514009360a37e0fab59d120f8/tuzigivezufupuw.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/fakalalebenigefanetij.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c44622c0aa---newumopavefuwotuniwisavo.pdfIn PDF document text
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/85315407328.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1ca71b32631af74bb007c2d1f5620479/1409067519.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd53ca402---fapikawuvokaz.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/pevabapufekubiwirusij.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d160617eb---84469226932.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073de7d83519---87745584996.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/poxodutetuw.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/godedufojanaxezetopugej.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/18441684136.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210829035317.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/32452821332.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/98939499320.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/22619026735.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/gowowerevunulutivo.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/kutit.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/tigulojerarerodof.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc05a4b5102---moripudamotimowikabop.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ggsomlpdvisjce97i7pl0r8ui3/vajuzexoxawipetexop.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11ef2d9d0---jefogijuza.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/76270338418.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c9e42cc3ec---11524653707.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13733d3f65---53167811070.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/74656410228.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_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 18568 bytes
SHA-256: 139e476dcde942c46ad433dbbc5edafd7660656deb2d008df5d2a24165db199c
font_02_sfnt_off00013b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B60 10892 bytes
SHA-256: c91eb11529835c9f55ccb3947768da3bdf8daf8d474da5775dde6a6d5d6f09ee

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