Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fb1bdf825f9443…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 22:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cc941343c379246aebb0064c101cdd48 SHA-1: a101d7e3a4eaa1503598de1aff0e07b6a8f49482 SHA-256: b3fb1bdf825f9443c33c9db0c8dbc57198e221f5684930f0c95d627dc6d3f5b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests potential command execution, though no specific script was extracted to confirm this. The primary function appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://chcial.ru/uplcv?utm_term=best+screen+recorder+internal+audio PDF link annotation
    • http://ps-chiptuning.hu/userfiles/files/21543812602.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feaaf1c470---88109097655.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/mozojedetudupolagubanoz.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tfbke32mhro45f14aum702khq3/93488855721.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/kiroliparigomimewak.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/47990052426.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/31027800744.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/86315576332.pdfIn PDF document text
    • http://salt17.com/userfiles/files/kininitid.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/bigigepolidiwikozilozufi.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/59845236090.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/buzikonifajo.pdfIn PDF document text
    • http://air-con.ru/upload/files/borosarafa.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/23364336604.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/gizonutaluzimijime.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/19243061702.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd1969fbc---vafusezazipegekemab.pdfIn PDF document text
    • http://qdcmd.com/data/files/vutonipuk.pdfIn PDF document text
    • http://www.bash.cl/media/file/55522391107.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/20411602881.pdfIn macro / runtime command snippet
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0eaadd8f5969ee59c1b85d61f2144e31/faditijutuwi.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/92466420818.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/60805337646.pdfIn PDF document text
    • http://www.bash.cl/media/fiIn macro / runtime command snippet
    • 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_off0000b26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26D 10516 bytes
SHA-256: 83e8a434ddf97c170716a362011953bd76d862bb67a90dc292c6a58fb330a471
font_01_sfnt_off0000ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 16100 bytes
SHA-256: d2914293b2d9afa0cb583525eb9ab29230d6199ac4a66c77808335084d32eeca

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