Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cac44605f5b7977…

MALICIOUS

PDF

131.5 KB Created: 2021-07-29 17:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c83bfc4202fe4de079aa450cf64e5bbc SHA-1: f9b0f886269b64053aa3dbee10b948f5111ce66a SHA-256: 9cac44605f5b79774127e1c331d4e9f5edb738a442707f84c18aeefc3b13529e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this is a link farm designed to direct users to potentially harmful content. No scripts were extracted, but the primary attack pattern appears to be leveraging external links for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9759

Heuristics 5

  • 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=tongue+twisters+in+hindi+pdf+download PDF link annotation
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/usa4jh13s291trlt302636ai4f/289372808.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e126348d94e---85394119957.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/gepililuseg.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/72136620669.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/diwudelududegotubod.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ea855feddfac09da8a2a3edc75268038/zupolid.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/40028543491.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/2011704424.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/60162887029.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/86205055d901a341250c105f018234e8/tupasuwuw.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/sogete.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ld4af2ss4tecqa5isv4l8cm1rq/37232287345.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160abd65c13714---83016219520.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/3bfb0b842c0f55454eff5c4117013faa/vevubeb.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/tobigovofezokejawukil.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/1kjk3uh0rpf0apmggu14tr03hr/bujovapakigirife.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/jelel.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/79998466554.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb403629faa---kapofipufesuritixilewefe.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/72706079794.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/49733ab869ae8a1d31e3e23c89acf57f/tiverojevajevivukal.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/vq1u6t1tvg7nnujuqtscsiamt5/wifaviduzotekoxuwakeruga.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/73691211742.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec596ab79c---lenegituzipimenutojopul.pdfIn PDF document text
    • https://pellevah.com/upload/files/6013495971.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18173 19856 bytes
SHA-256: ee9bcd509fb68cf0869c7a9f602df6422ae9105579f7e884bd4611f942ab3969
font_01_sfnt_off0001b68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B68B 10924 bytes
SHA-256: ce66c60fe1622072671c7c263746d01d13e9810ee63b0bc0eadc34b5626a0b9d
font_02_sfnt_off0001cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFAC 16448 bytes
SHA-256: 35188e5b2dfc77a9108ee1aa1077bef7572e8907ca734476abaa33a4a4014e08
font_03_sfnt_off0001e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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