Malicious PDF — malware analysis report

Static analysis result for SHA-256 6338fc29b9959e30…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 14:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 98a61a6e211b41b20358224b75c362be SHA-1: e6be94d4f79d3dae2e95bb7205b716fcfa06e840 SHA-256: 6338fc29b9959e30e59df5b0821662b831190447b2075bebec39bcb06a8cbafe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution attempt. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The presence of external URIs and link farms, combined with the compromised CMS upload link, points towards an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crysiq.ru/uplcv?utm_term=sherlock+holmes+kitaplar%C4%B1+pdf+indir PDF link annotation
    • https://rowadalbyt.com/userfiles/files/fumononipatavagit.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/mulomumigikigufenizofixo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161341e7b743f6---wesanigosuke.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/1274886308.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/vetogazisufimezosuvadose.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/70236121292.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/72785506710.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/metaxa.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///fegobizuzikokizu.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/22041729047.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3547113d---24541192951.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/85133508697.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/gadofejusekituvixipuluwur.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/nuporobusi.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/37055490309.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/47605919697.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zusovejelozu.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6116289835.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/80358201035.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/19141379758.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/692b8441ae81f2ca7a7921e0673daf1e/nulotowudopuzazeli.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e44d8d024ceafc32a2fe13016a764043/11418922298.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/gadefigewevedovororipiw.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/3152758297.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/29301509925.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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 18652 bytes
SHA-256: 3988b549bc20266487ef14fabc8fa3140ffbe4ec297f69933c00a78b2e4e6e1a
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 11100 bytes
SHA-256: 03f6953c1f7a54db9c4d9852e4ebddd486a0b9ff09de1383f398b38c9c46bc3f
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1