Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15f143c0c3d9c82…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 07:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b5cfd4503616bd5e07312ca6cf39503 SHA-1: bb7175f00557ef511a50138943a70cfc4ce7cc00 SHA-256: d15f143c0c3d9c8227e259a91adb4398158b26beddc166cb075ee08b7427fd75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://mtmnetwork.net/uploadEditor/files/26408586404.pdf In PDF document text
    • http://umrllc.com/userfiles/files/nibubipareminobipeloga.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/vodufajitijaserivoni.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e66badf5b5b43bcf2e933ba84de5bddd/17320534179.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c799d31b2a8---tejarapifatixedak.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05360b9bb9---xuratisoxumigapowitupalu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/pqphuhjrgnhh13qhbhoksrabgb/39192981616.pdfIn PDF document text
    • https://lecachet.fr/docs/files/wimix.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/36582514648.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608301c8dc044---fulijasuxovidizosuzop.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160871de30d71a---vojulusuri.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5b85f97fe1e1dad055ebc2f37ce1fa9/rofegegiviwix.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f1926fb13ae1be6dccfa34924eb892a/68303632660.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1ec46a3f---38510651694.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/nonujuraritupopadi.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a18ac03c725d4b2a0385874a359dcfab/26781622527.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/sitovebug.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///11770416052.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ef98f18ce---lebifenipoxudoworazad.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/54055396664.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/xezefetikidaka.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/zatitazinisi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608026eca93c8---69345724511.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/36523791336.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/tometarowenoxirasumupesa.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8cd23d5daac912186510636bcea8a6bf/sunavupotewomoxig.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/73282dbdc3950f088fdb02d02a01147b/84830943979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stabbing+pain+in+left+side+above+hipPDF 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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 16944 bytes
SHA-256: 806e0da00135e76ede4068840c39e62fee99561973853fd05622916e054926a7
font_01_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 10960 bytes
SHA-256: 6acf52bdfbf56c8ed8c0d66b7a5ad4b2a6274e76f448161e13200c9b7472d8d7
font_02_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1