Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a6298b47cb2dfb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 01:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acb5b94ca16f4a58ee1dbe1b12cab83b SHA-1: c94b99950884e3bbdc9f9b111ba9e0e412254650 SHA-256: c2a6298b47cb2dfbe92a8f368f66bb731a867d2e3ce1021d00daa124a5a1837f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to execute malicious code or redirect users to phishing sites. The presence of multiple external URIs, including those hosted on compromised WordPress sites and disposable hosting, indicates a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://conservativista.com/js/ckfinder/userfiles/files/59697178123.pdf In PDF document text
    • http://citygclub.com/ckupload/files/85218315767.pdfIn PDF document text
    • https://vientangluc.com/upload/files/8655420589.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/145718cf7b1668990b285564c327c89f/2137995396.pdfIn PDF document text
    • https://silga.ca/userfiles/file/pufofabapamekerojod.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/nefororafavetepuzapedaluk.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1bda886d5---11406852636.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/230148108898.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/fuxevibaxevuli.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/mofisa.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/wujagologakejezo.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/73290370308.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/23/file/20210723_144542_135.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/950e88371e6ed981b302b16b45503b89/pupevepepatuwuwuseximak.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/xeranikogasalejenojuvapu.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/dafirakeba.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/95447846145.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/20275350345.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d6ffabdb547b3806b899a0f717661838/651745434.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6eab521d0340278fb046f94a98a37517/pidutotakulazedipitururek.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/94623344435.pdfIn PDF document text
    • https://nistd.in/userfiles/file/jorevolojenuxilirolat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=16+millimeters+to+inchesPDF 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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 10456 bytes
SHA-256: 8c135c65abeae102e9a93ecf65455dc052d2c0b91de1d5891e7b6345ef31d5fc
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 17520 bytes
SHA-256: 5c66a3477ac31bd4155fc0472bb5521e630d36fcd898f6ccd95cb4c57ebea2d7
font_02_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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