Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c206879720bd5c…

MALICIOUS

PDF

91.0 KB Created: 2021-09-19 22:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e137192a5f5004ddae9ccd16e5edbd07 SHA-1: 09550c4145a37c62c950ba056ed81101547c8688 SHA-256: f6c206879720bd5cd458cf4c8831ac8acf85ad14b073caf5bdef7aee30e4103a
156 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. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://atrax.hr/files/jupakuvujosikobevazud.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/87f75c85482fce07dba3345310ec134e/xazidumexotaviropadopina.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/414cn7jmanisu83tcg1b5fnj6t/63534923951.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/zikopejiberuju.pdfIn PDF document text
    • http://carszana.com/image/upload/File/31489446464.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/57646252822.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/wefutavavanejazaxoperaj.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c33db1c70---95679493890.pdfIn PDF document text
    • http://qualityroofinnandsuites.com/nbloom/fckuploads/file/21834034362.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/20149465784.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11a6c06ad---fewikafes.pdfIn PDF document text
    • http://househouse.it/userfiles/files/36218628231.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6340b5f73---pumadetamilemigosorafe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/48bbd7f490643c8d8bec64782fe160c9/22141893398.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614471d36f811---woludajasajumatubegatido.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/dogaj.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6e70891af9deee9e8fefb8ae6a3fed62/sejomedi.pdfIn PDF document text
    • http://tiquital.com/documentos/file/68175630171.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/ruvalisavanalej.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/jagunivejuvegave.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/nixaridiparigatam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tom+and+jerry+2021+chloe+grace+moretzPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 19120 bytes
SHA-256: 8ca063b2f6176b757ea257ff48c02a8a2304ab0f5572e105b36cbe07cbc346f6
font_01_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 11116 bytes
SHA-256: 8f30f36cef424c38a763c7d64803bec3d1bd0cf43fa3d45c5b2517a4801c8040
font_03_sfnt_off000142c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C8 17760 bytes
SHA-256: 2d91184b922375feb4c591da25b65bc3f37e179cbad041e99c362cb617bc004e

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