Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55a2b135c6e4669…

MALICIOUS

PDF

84.8 KB Created: 2021-08-19 14:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4aa3443f4f9848edcca3fb3aec2b12b3 SHA-1: 5ffc7a2a7e3985b608df6170b48e6669da864063 SHA-256: f55a2b135c6e46697fa7ef979f5eb8583431249129d01e84be5cbbf213595b27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic firings indicate it functions as a link farm, likely designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially facilitating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.verimevzabavu.cz/ckfinder/userfiles/files/97286362231.pdf In PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/otmj746buuho56bic8rdbrl7au/82183117854.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d036b4aa8---2604630999.pdfIn PDF document text
    • https://slide-bearing.com/d/files/23680279663.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082efd154ad2---jaxovirusapa.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/6fs5p7sgpav2udv2798d49t53h/25114176325.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b915af953ac---toletafipanarekubosiji.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd5321f871---58031648064.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a09022254b---kagamezitiwuzigofopi.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/lozevowefawepujamusigep.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/xafalot.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f256f0ccae3d8ff93c6c5516497f9f14/99373994048.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/44170817931.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/tubusenotukesabunesut.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e223fa9792f---86480023027.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e50ff0ecf77---dawuraxonirijomaxazaruz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9t4q9c0sh2n2tvc9hrer97h0j7/mafavizifov.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/41849606458.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/vizelezewofo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609123cd51b6a---tatedumodiwifabisalo.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/67594713377.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/41993669612.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/dd6dd18ff2b2ee8793cf6ce0ab6b0cd8/89808960777.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/29172997642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=trace+%C3%A9crite+les+nombres+jusqu%27%C3%A0+999+ce2PDF 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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 11528 bytes
SHA-256: 360c9ac1124c995ca5a417309d9e19e0bae33dcf136b846664a615c1dee6257c
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 18380 bytes
SHA-256: 66c971787198730844b31a970cf227fb6d3600aa4ba5ddd73da34bb0755f9e92

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