Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b5fdd39a268080…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 13:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 021b8b0045d2f3f1b7db70b8b79b3a6a SHA-1: 3c254a453836207d730a95be5986cda00ab84a85 SHA-256: e0b5fdd39a268080380fbaa7d144ab46b14276fc7350cb7b312b93c194e9842d
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 'Browser extension / update installation lure' heuristic strongly suggests a social engineering tactic to prompt the user to install harmful software. While no scripts were directly extracted, the presence of numerous embedded URLs, some hosted on compromised CMS upload directories, points towards a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sport-jicin.cz/dokumenty/xafixibogatuse.pdf In PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/78955279926.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b299d1b6---semodatonawopejixevinimet.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f8f3df8---vaviparikix.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/gegig.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/30515478508.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8q0le13b4k6mmj84o27oveiv05/visudodonazobanevabej.pdfIn PDF document text
    • https://arendic.cl/files/32299438222.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/pitivurixazinirezaxe.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6c6e3f82---xotenazajiwimikokowukik.pdfIn PDF document text
    • https://plasy.com/uploads/file/kubalaverexeletaxogevij.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/pepowokosebamoraxowuzunez.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/mepogoze.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/kmrb27eqbl7g5468qghlhnqanh/kowojoledepiri.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/nalifemazupinin.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/1oiqcdc470i95p69goi03d981s/55122807633.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/roruvos.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/talitawibezinobaxitupo.pdfIn PDF document text
    • http://falerisztika.hu/tmp/58717196894.pdfIn PDF document text
    • http://recrute.fr/files/files/2470554974.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/gakedogelinetodafona.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/63e4e2f7123bb259b08ce7180b720aa3/65253827750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+to+excel+converter+without+emailPDF 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_off0000c35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35A 10928 bytes
SHA-256: b8ece9fa86ca36682b3418ad65bcade288243418dba199ff34c530b13a5c92cd
font_01_sfnt_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 18360 bytes
SHA-256: bef78517b24aabe33d51a44e128b50b50d5d75e7eba8c14c77a2ab695feee062

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