Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fce6e60ad323b7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 04:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb7611de2e8db8839747f46f8c25ccf7 SHA-1: 9ed6cbd7af2c5b457e02d9d160bb5c0f399f4a61 SHA-256: f6fce6e60ad323b728371890844d79c9a6b403bc6a2af691c89fddc111aa5e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=aoac+official+methods+of+analysis+2016+pdf PDF link annotation
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d13728e74---rokokoxetelavoxi.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8c61baa150144fa85ba596ba44628535/momadivajovosarajutogal.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/38919135292.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4ce1f879b014f6bc18d00707fb71fa9/giveben.pdfIn PDF document text
    • http://hflchw.com/upload/file/rowedofev.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/suwakot.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108050241002396.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zeboranumumarojijunin.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/jesovabifav.pdfIn PDF document text
    • https://polaria.cz/images/file/xidilusowonipevepozesa.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/gugidizosawumadoridabazo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/917a65fc3e58b10957a1177d2e1ccaa1/wupazinu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a275b36a0a0---warebinorolokesopuzib.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611439e20509c---92995193319.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/vakajomuta.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33062df8bb---nimoz.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/golojelovek.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a20a3c8f7---85179675958.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd8b92f88---torofisagipojujujatiwe.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/37251121357.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/90597089934.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/84057758093.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9311929b---zofilegotun.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_off0000ba44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA44 11344 bytes
SHA-256: aa035a566ccc673e8c665546ca0edc3a0790a2196025593beb84b779ac519c63
font_01_sfnt_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 16084 bytes
SHA-256: 58f3d03f2b5bd9e18808594827356ec24e67bb8888cec0ecf1ddf26c98af3df9

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