Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b475d7bc19a644…

MALICIOUS

PDF

70.0 KB Created: 2021-09-23 11:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82b0e7cca4fcda2d830f96fb5bf17ead SHA-1: 5ed24efcbdb42ff1affdb050ac4f8c182b6a6526 SHA-256: 20b475d7bc19a6444acc4dfc716ab99830346cb3d1f3bf8dee991f0105cd7eb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. An embedded JavaScript stream was also detected, which could be used to further obfuscate the redirection or initiate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=private+dns+android+settings PDF link annotation
    • http://phanmemerp.vn/attachment/files/21846033592.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vvati8th3tu4f58vn364hindfe/tapevuxamuki.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/juzufagam.pdfIn PDF document text
    • http://jmapilani.org/userfiles/file/16461499439.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/13096517476.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143fcc339089---50231169238.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/bekelamesev.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161371b885b702---koviwisabu.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/xowid.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/9787713236.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f8e41a26d98b220fa6f65276cb352049/83743171818.pdfIn PDF document text
    • http://fructusartis.com/i/File/59977547730.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/zanoxado.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0fd892ab---20076774725.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b6d9e10c---70780172015.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/sotopikiwuv.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/80099207895.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/82438734415.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/42589335095.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/29381710581.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/xurofulesa.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mopesawefinus.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/gatugazijo.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/56901676431.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/64292689571.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146f5972871d---29117360297.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_off0000b3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 15348 bytes
SHA-256: 7b78f37665b0761e5ee60ada42df6f9c522d5a3d91ad80c782dd6184df2c7265
font_01_sfnt_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 10444 bytes
SHA-256: 93e91e94c27e04535850cdaeb5f79dea9435e61ca75ddb24a2d1d8024171075c

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