Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c995f4917c3328…

MALICIOUS

PDF

90.3 KB Created: 2021-09-03 02:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 182054a3e70e71584aa7514f2f121c92 SHA-1: 094e723e0b0cdab5e1877f67c28ae42be336e7f5 SHA-256: d4c995f4917c332878e4090efc079a613e785eb6430b4f21e19bbeb25475b28f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely to distribute further malware or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://heorungminhphat.com/luutru/files/59537536991.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d28d409cb81---sevawapope.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac5771f16---49398928545.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/rovaxegimifu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/cdd5ce78a87fa7d3197b2280c2b52b8b/25365589153.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ae5690f0---rivodojaziteki.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/53568430165.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae28458a3---zegori.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091588b0b0ce---sufotowunamobenagosiguf.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/4839615594.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8327817869125ace3db88c715b64ab03/nabopir.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdce29c4ad---99031153008.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/7368212613.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0219522001627197553.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/u7ls6622jedv14q2a2bn2qab31/85102974801.pdfIn PDF document text
    • http://wohntraumgmbh.at/fakuterizazufogoxero.pdfIn PDF document text
    • http://elitvorota.ru/f/file/wuteb.pdfIn PDF document text
    • https://ancoraeducacion.com/images/silujujage.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/texemalemuzuvemonabid.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dee292cf2e5c38dcdb17139e98a83056/jivokajitibimutoteb.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/99943827506.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/kudisanarasanemuzizeralup.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f0480801---90969317624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=saga+hades+hangmen+pdf+descargarPDF 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_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 19096 bytes
SHA-256: d689a0946687278b943fdf83d98fd83f07814ef71b8c9ee6a3df2d0c1e678fa6
font_02_sfnt_off0001413a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413A 10784 bytes
SHA-256: ec5b56e04833038878986cdfa5a0cb49b6625337842cad31fc88b00a20ba5b6a

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