Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71dd9f209420525…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 13:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ff18193862d87ccdcc3b3e0b8e963d3 SHA-1: 2fd21d61d0d19391b8676d7b6085ae89bf0eba36 SHA-256: c71dd9f209420525eaf05ae33b921437fd73736b148f3adae1d2027ea99ad068
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple disposable domains, suggesting it's designed to trick users into downloading further malicious content. The presence of compromised CMS upload links further supports the malicious nature of the hosted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9fb279b018241d995ed4465813ddf259/24586479160.pdf In PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/fivedavudijavesa.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161208dca9a05d---23546422978.pdfIn PDF document text
    • http://allasclub.com/campannas/file/pudixipugu.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/94989616137.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/fonaronafira.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/fijiro.pdfIn PDF document text
    • http://mp-journal.com/media/file/wupavixiwagavew.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d24446337---fatomodefabijisaki.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/vutalex.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/32599500174.pdfIn PDF document text
    • https://ccskin.com/geektic/files/tanukijokoweniberenobi.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/nenisakejojaxiw.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210719123342_mp8z4w.pdfIn PDF document text
    • http://lyshiying.com/d/files/48107207368.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/18ea935557bcf103c3f5a25b3e5f5206/tepumitavov.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/69545817426.pdfIn PDF document text
    • http://latgalesamatnieki.lv/files/file/guravilirik.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/makadudiz.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/gegijaga.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/36584206598.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/kidepi.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210703070824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+efik+hymn+book+pdfPDF 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_off0000c07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07E 10832 bytes
SHA-256: 0566ac5ae5be86a99c1ba370dd2579ab1a5a0a2ddf506e67d50df5069dae9671
font_01_sfnt_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 17600 bytes
SHA-256: c98b7849e98ffe05116e3031e8e0afdc1b0471d44b47d25dfd4f0c904e6771c7

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