Malicious PDF — malware analysis report

Static analysis result for SHA-256 147da5884f3b3ebc…

MALICIOUS

PDF

93.6 KB Created: 2021-06-27 04:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4133b757d631d261ed0371800f8cbebd SHA-1: d307535b731684ae1267e11cf9eca9a2b483b5ed SHA-256: 147da5884f3b3ebc984ca64d4c879dd8da22d298edbd0110de4142efe358ae0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://synerhu.ru/uplcv?utm_term=tuesday+nyt+crossword+answers PDF link annotation
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/3kc63j3r2oeifo3cmqbcv4mei3/93010057956.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/828b710f16cd9f111b35192f2118dffb/zoravefujurisiva.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/24008865375.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d4779bd1---silusit.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/61337893729.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b9d980fc93b3e9378f51c220c3511a11/vulegava.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/57213224032.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffc15c27d---rowizasekotafe.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844671d501a---tuwetovenivogo.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/34769876715.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4915eb019---vikibexafiboga.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160961723cad7d---4199054792.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b89789889fa---bigozibikara.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c44ab9a47---59239324452.pdfIn PDF document text
    • http://poorclarescork.ie/images/barajifatola.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/xizemetabew.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/f5ikvsr3n5v70g3ahfb9jcqb0q/zovibelesifojalobafovafo.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/44212625483.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1133bbc96e4178fdfd1426e01abd839b/wubaja.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/1333873726.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/rasinosapadezatewedoxav.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4e2omveikqh7kr872ss3sel467/towolemud.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/44t69p2a92l13cv0ip16jh42pe/jeduxokazizase.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2e9e876cf6eaf774d927aba4ed7b89c0/duvanilabofevisazakazifo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda4aee4bc---fejurirofemo.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/vogasovajud.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_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 18152 bytes
SHA-256: f5447abf97f225823fb7495c2d13498f9d8e4a8678791b6faf1d9e249fa4ad50
font_01_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 10488 bytes
SHA-256: 6bc561149242376c122738d0802c1fc076e107cebe5bc47b399dc2de19e1f638
font_02_sfnt_off00015133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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