Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a151674383c634…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 06:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f7f9ed1fc53bd65df84e778c38c6cac SHA-1: 23a06de1ce52a95cc291481dd655aa8ae25e1a4e SHA-256: f0a151674383c6349c0d94d5155dc466c7b13378d462de5fe3105d3c415f936a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites and link farms. These links are designed to trick users into downloading files, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=first+mobile+app+download+apk PDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148963ad3154---lexikilexajatojixum.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/desafamarezixirutari.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/20339093329.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/lidasilapazabekonule.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bowupige.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed56781ca---23109889554.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1632351163.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330d83382d9---gilavipuwevaferav.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/54007446192.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dasijomusegudowi.pdfIn PDF document text
    • http://www.centralperdana.com/file/lunuperokuvof.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/822d285f5e3c041a89e312f6eba1b0ce/talixe.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/92860928350.pdfIn PDF document text
    • https://kapefashion.com/files/files/64025029719.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202191127432020.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/fevijamoxerunetemodunum.pdfIn PDF document text
    • http://sfinance.mn/userfiles/files/vetodamafubonazazowelir.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/68725443382.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/860e0b9517679f76775d92ab4eb0bc9c/litaw.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/sezapukegavutiki.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/35740752654.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/ralizebitanoxabupaku.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/fivomurapebelinoguna.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/33925556928.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/90517848904.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/97154061894.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_off0000b158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 15812 bytes
SHA-256: 0dacfede2a46ce3832123ea5049ef3dbf65e2801d7863afd040768a1a43e3911
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 10848 bytes
SHA-256: 0f64e54c1399314ee71e5be7a1f4d13d9145bd90b2aa664bd0d4ba03c1dc0fd0
font_02_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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