Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8997644bc30338e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 02:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b67fed8b801c7b724e13dd3d7c56519 SHA-1: fd573f20874c54e5a514815f1c67f86951bcd2b9 SHA-256: a8997644bc30338e9e171cd6d91e596f302f2de262826d2727dfd64f13f65535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content, potentially phishing pages or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b27cf89587c428d374cd3b486684155b/xenala.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074805a9ca1e---28222307019.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/kafikeke.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086f88d76b4a---56965603217.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/24256bf77f968ac0d54aa2081d339607/43371539317.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/wovivuxudigokagarojub.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/tulagakitanu.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/70406211998.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076db2f7cd34---zabadibanirutowat.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec82550b86---6088435434.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/30443334168.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/41773669278.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jvhrojto9ipjgr9tf2ar2hkd31/xilizolos.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/mujibudowobafofuv.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/7ad2757abe0b173d93f1ea7884d3aa26/73856841876.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda39503c47---jufomekilebaketujo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3486940e19---nagesekarajid.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/piguxopa.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/58378316869.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/88166055099.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210606_0D166562D3FE3346.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/61499334005.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/20099217546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=5th+sem+calicut+university+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_off0000ba26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA26 16276 bytes
SHA-256: cdb608640089d13ee14490c6b64d60612f52e12d5610b20755ce71c38022c769
font_01_sfnt_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 11084 bytes
SHA-256: 1fad518be6e8fd5704ab8c82fc6500e992bf4c6c08d80909a93302741a7adc05
font_02_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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