Malicious PDF — malware analysis report

Static analysis result for SHA-256 570ef7df65d881bd…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 20:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a68b15c83c6e67bcb512c349f559dd71 SHA-1: 7096db1ebf258e063bde0713ad014bc0a19759c3 SHA-256: 570ef7df65d881bd7a0bd8038634cbfa190b503492a7047e6847e7ee1784956b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://irlanc.ru/uplcv?utm_term=instagram+private+account+view+followers PDF link annotation
    • http://vlajkylevne.cz/UserFiles/File/12634151900.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/759939124.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/97447196498.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/mawazizedegonosub.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613834b9271a7---nikawazupujir.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/176486649.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/55945178846.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011031588524.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136482302a7d---pufolo.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/77807251031.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2bd3347d1010bb0e53a5182fd6a66818/79117348626.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/gawiwipodudixerop.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/36219311589.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132633cd41b5---netojokizefitofuweboni.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/97588207759.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/17610057863.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/fujut.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/20794402589.pdfIn PDF document text
    • https://rotitelor.com/contents/files/19638196745.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/nevadefajupulamomukura.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161349df5be02c---14266338238.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/gutofedoxulugawoleg.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_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 11028 bytes
SHA-256: 19b28b8ecab861711d0f0a93595d464605a1d25817481194636f662aff387f3b
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 18580 bytes
SHA-256: 2355722b6d590252d9357223e3043de12cc64f534d3cf93595ca0b44dfb757d6
font_02_sfnt_off00012a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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