Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62b8fec97d6559e…

MALICIOUS

PDF

76.5 KB Created: 2021-06-14 13:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: eaf68bffa69ebdb5fb66715ffc77aa98 SHA-1: d33972ac2ef02e1ef37fb49bdaca0af8ac3d440d SHA-256: e62b8fec97d6559eed7a9e041076ffdbbfad2711eb0dacc7ebd9b458f4a4ff95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple links pointing to compromised WordPress sites, suggesting it is part of a phishing campaign to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'instant architecture plugin free download', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=instant+architecture+plugin+free+download PDF link annotation
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/871903ba9e3f014c537e4069894ae78e/bumutobijenitubodoju.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/573d732fe5932abc6ac787523847a9b5/8406598406.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/mipafajew.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/83614891328.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c6ba89ba---96201191069.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/giwovibodotefiv.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3d281fd2---31421329380.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/turulovo.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lirakuxelunironud.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a367a0a94a2---91391333679.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/fezameketoxek.pdfIn PDF document text
    • https://tmtteks.com/files/foveluzotifefusoredato.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/pgs6k3ac4d3hs73j2edqbbnt7e/46368335536.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/j462ck5qq8739adt0u56ehuud2/jagudibib.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe9f601c9---11550830056.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 5444 bytes
SHA-256: efcf52755e3697b075ec6f14018b1576d67e1d43b0bd403776a06a9ae24591e7
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 11628 bytes
SHA-256: 0144e173eca95800e5bdb800c03f5a8f7133a6aeb86a8517844d2a7194168062

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