Malicious PDF — malware analysis report

Static analysis result for SHA-256 7084a7a52d0c77f4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 21:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b9969a0524974a9de00d050f1df0824 SHA-1: 0da6d1c22def52e452453535c4a507c5c953ff76 SHA-256: 7084a7a52d0c77f46ca0e24962ef31cc500d93b35c6d1d49b560ac3e6ba0a7b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=introduction+to+the+gospel+of+john+pdf PDF link annotation
    • https://resicolor.com/upload/files/zeruvenazawekizowala.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/42712052886.pdfIn PDF document text
    • http://bastola.org/userfiles/file/73805400223.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/libuwodogupudaw.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jedivonokekolenovo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614427ba8573f---3010676457.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/tizubunifufeja.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/18750803475.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/21425934736.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7d315587---18414318132.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9cc99d6a---60046851745.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/85538140261.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/4559873174.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pabugisorix.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/danubumimibalejusoz.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614185e563d6d---95123707906.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/10851884742.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109072309182435.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/49200155879.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/99338304934.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/56763442750.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/gamubuvivobakebiw.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/73582504580.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_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 17860 bytes
SHA-256: e94718091819d01cb6de351b6e3054e5a7181a0ab90ff958c47ee36ec681441e
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 10916 bytes
SHA-256: fc41dae0fac627a04025004db9e6ad675a7772e1e45e29d4cbdac7ceb7dc1145
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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