Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe5efe31579db97…

MALICIOUS

PDF

94.8 KB Created: 2021-06-29 05:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 699ff00c18a1322d209b0f94c66cfb98 SHA-1: 15f98545b35585053d619d52382219b4d148db46 SHA-256: 5fe5efe31579db97fafe39ae8173920c666595c4138d89f04a82367329b5bb77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=what+to+study+in+philosophy PDF link annotation
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/af9366defae3abf7cc9a95d8d42e2c79/86546380582.pdfIn PDF document text
    • https://susta.vn/userfiles/file/85970477528.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abe73f1b21f---91984124828.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c883119e4f1---78767144360.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/11174404402.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/85bfcab75306165ef7864483b228effe/zaxemapafewegav.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9ba5174a3a91c4681a1e2241d8036254/87378884036.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c106458f7---sifedironilo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/lnanmhnejlchb03me5ed3tq5fd/sixaboteja.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8509ec9833---weraxogesariwodusabigimav.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/vudarekebekivugunanotimon.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mupudomuvatixowexujuzuji.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44b7df2a4a---95738565380.pdfIn PDF document text
    • https://scheidungsrecht-best.de/userfiles/file/luwidige.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/74602509872.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d63845b46---56993631572.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cffc665d626f56e1ed516e746705809a/68941302204.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/23612616634.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/lojilisoravex.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe1eaa3790---14373064892.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ad2f936d2f8---58123924086.pdfIn PDF document text
    • http://prestopc.it/upload/file/wojuviwo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607394e1518be---sobepadagomefalikafakitu.pdfIn 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://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_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 17676 bytes
SHA-256: 50b8394e7695ec69ac17e664dc846c9aec35c31ec77e43b6b40e91ebe40bcdd6
font_01_sfnt_off00013e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001563d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563D 10464 bytes
SHA-256: 6621ef6609d6e0d24ee83e31cca63c88ece26a08f0d821c7e34c4389fea62604

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