Malicious PDF — malware analysis report

Static analysis result for SHA-256 09143d31a2a3ab8d…

MALICIOUS

PDF

110.5 KB Created: 2021-09-05 01:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eae16b542b4fe45fef15a2c42391c79b SHA-1: c6004b8aa3d8e343a5c494ddde045cf5e8398fac SHA-256: 09143d31a2a3ab8d6c232abac5a9235e552986b4efdcb3c35f745779dd8f6b3f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The file contains a large number of embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall detection profile strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/a9pfj4ga2onjk5b573sq0bnf15/gokikijuxopajidavenixot.pdf In PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/61879050297.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/rimosajenad.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/8570371723.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2e1da262d4422de6934d15829ef60b6b/pilikizifikil.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/salejutomajorezojere.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1g4pam548s49mijne6of1j82c7/vanulofolomesuroputuge.pdfIn PDF document text
    • http://pk.mo/userfiles/file/fojevomewaruluxo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///27158178705.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755405a4fc---bopunibunozakamape.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745942ed1c6---pimepijofagexi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/817764e058fc76bddf84e645ec873baa/26224123139.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ead146ea0---wifikopexurofimifafikorob.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d458b9bca25---54929140319.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/nogekikasozi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4e05a94e---4242629060.pdfIn PDF document text
    • http://learningkey.org/userfiles/makifenufebokorogadiga.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/87130726382.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4eb83825078ea5faf1fa416d4d4b00e7/lutudozirapaw.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/llknbo9losb128ro27igvrrk2d/71047389255.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/30487582086.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d0add44b---dozadev.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/patexovoxo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944df40187a---52864798724.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tofikabedib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=livro+abandono+afetivo+indeniza%C3%A7%C3%A3o+por+dano+moral+pdfPDF 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_off00014116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001592d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592D 11180 bytes
SHA-256: 5324b9bc2adff99c055a5967230e4a10cc6f6820e60efb125d6000d9f6d03de0
font_02_sfnt_off000172b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172B2 21632 bytes
SHA-256: 2b569e857b178dbd8248dfe1311a801d24057560a2a291a0cf5f50dac5333d7c

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