Malicious PDF — malware analysis report

Static analysis result for SHA-256 23007b20b9994c4e…

MALICIOUS

PDF

93.5 KB Created: 2021-07-05 01:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0a9ead621d740e298271be6143819cf SHA-1: f03ce16f0ab6615a05ae28a134a2546a17f4e1a8 SHA-256: 23007b20b9994c4ec8eb68d28c7181b2f0fc4c77fdd0fbda5258f04a13f8df03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection by security tools strongly indicate a phishing or malware distribution attempt.

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://drafthe.ru/uplcv?utm_term=parable+of+the+wealthy+man PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e0t15ubobtanl6ruklt6d6t292/pusobafip.pdfIn PDF document text
    • http://bamila.vn/luutru/files/wigisowajejubuzonemixoj.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/97a33e98fae0a3198cda192efcb0422b/vunozexozesojo.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/55540922884.pdfIn PDF document text
    • http://fitviewer.biz/files/file/roxuximet.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/98qfk0oks5c063ictgvgql2ror/gukiwix.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa4e10c6d---ruxodakezuluvelikezemiz.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819f566a5d4---jiwosakawetomokumol.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da331b0600---berepisojorurad.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/77858703727.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/26206169166.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/daselipeximoxanefubanikix.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/taboxonakufozadurajunirus.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/823d907c7183b6e2d405bc78cecc003d/nasogoduduvanoz.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/selotowubodekalukolagazu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/52355952791.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8921ed8dv06plvhrb6sm0lbtl8/dukarakanewebosar.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/e56b39acb19359573385e847f4417813/76486954294.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba71d183b---21364041101.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/nuzedukego.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/73298010092.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/j3tmbn53ce7h820bs8nfgoabbp/zumanokewemi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073e959e25ae---52531254533.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/zomosonesoralose.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_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 10560 bytes
SHA-256: 297186344b5cf65998a6b60b98c196132da466f29b225029bff3ea2e1a4f5d8e
font_01_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D7 18316 bytes
SHA-256: 13ea01156d2e94abf850295d61c0c751f720896a234984ecd19b6781c866dc18

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