Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a3a9b54a2417ce…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 19:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d831c6bb24948c82f558391be22b7ea SHA-1: 54b9ee810404e3c49a56e105a74b7de926118d71 SHA-256: b0a3a9b54a2417ce44b6956bc903e944ac7aa0ee255b1bb48d7e18b987166bb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to files hosted on compromised CMS platforms or disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://alves.bg/ckfinder/userfiles/files/48059642432.pdf In PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/vipanexeke.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/zafozomuxugaxawafawaj.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388fc66d465---dirumugemada.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/tedozipasomujujaxumumaje.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bifapiwosu.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/vupanonebogitokisedu.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/levagulotojipopabilezuvil.pdfIn PDF document text
    • https://terracell.info/images/file/68490593509.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd33545c8---tojogigakozalonezod.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/bowagixajex.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/nilaveluwud.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/38523804409.pdfIn PDF document text
    • http://pk.mo/userfiles/file/burisuxotulasodevu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6937d55c5d79d191bd9bf29d5af7e797/mizenawevadirabagoxix.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613658ab6a330---77410006556.pdfIn PDF document text
    • http://beiks.info/public/file/kumexemipudaki.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9e46e9f67874f43415bf0361c184fe45/pemodejigisuluwazoga.pdfIn PDF document text
    • https://armenia4d.com/contents/files/notejulazexivagobezag.pdfIn PDF document text
    • http://chinalabware.ru/d/files/72861329369.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/jojulen.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/28901961965.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/zaxorulukikulokaxagu.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/66070881818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+install+third+party+appsPDF 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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 10452 bytes
SHA-256: 389a5b745808c0a0d8c05e73c0cbe21f8d836eebf7fe7b2266c687885d3c4984
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 17544 bytes
SHA-256: 364f54131a752b5245b71830711bce9e3d9134955892562b3bd895f6d87fdbd6
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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