Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd220fee68c1182…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 01:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21fd14d09181ad32b23619e289f74f58 SHA-1: c82d468829019bc9b1da4478e5f01d2dd48b9c46 SHA-256: 4cd220fee68c11820feec9df7803477db46bb86ff2ee203513237cafc6a8ea32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=eil+approved+vendor+list+2017+pdf PDF link annotation
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b65caa50d52b1075d76ce05071aa74ae/55805137454.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/70895475238.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0654cebe9f---89079567378.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608541a202847---zubawejodebabosiporopo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/87899114592.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/60648901584.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/10592341092.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/66115830814.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/kagurovesiwajawaniwo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080b57b04577---litaximijil.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/v2hntc90gs5fdf2aarvq9uqt53/netejagowanofu.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/woxalituxerewuwa.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/38580189365.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/14392990853.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077f236b146b---gegolefudanej.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/nirigapanumefojibel.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/89016291514.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a65edc1ad97c5bf1624b2d53d70aa546/kavapixofumenawawonu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nekokepi.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/litasi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a8445f688a7265185acdf512138feb3/rekamexisafukusirofewixi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8c7e5622---30659170647.pdfIn PDF document text
    • https://fallsplat.se/file/maxikemivagozikijelusuwi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8e483cc5---pukukimedalimelidi.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/ralubukiw.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_off0000c880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC880 17180 bytes
SHA-256: e7738c1488b1c9b6c63af461cbbda0312415d3cacb699904c899aab8d66a735c
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 10884 bytes
SHA-256: 251147b45850639cdbb732a2d1ef817f2e732696412d39c6b50cf18a2d28496c

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