Malicious PDF — malware analysis report

Static analysis result for SHA-256 31acf3ea2395fb0c…

MALICIOUS

PDF

89.3 KB Created: 2021-07-03 12:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 327b2e03a76a4544c07b36b60d6b5ae0 SHA-1: 1bc5579693f56035aed73dc559885b1d84e4d286 SHA-256: 31acf3ea2395fb0c7c8b159773d86fa6255a59d1cd1753b1f4a872c433dee31f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links pointing to external domains, many hosted on compromised CMS platforms or disposable hosting, further indicates a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://elazentrale.de/images/uploaded/file/24360563832.pdf In PDF document text
    • http://color-gateway.com/userfiles/file/52264458771.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b1e32706---80390680148.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3jbles1n7u1b6hjjipbi1uog37/28789975007.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/voxibijawabubejokirakur.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/flqnjf9avc1ada1j4e5qbkpi8i/dafapekiwupanidepurimovi.pdfIn PDF document text
    • https://fultoys.com/userfiles/904424223.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/92c1360bc77aaa4f04ca068457224ebf/jaruxewovewofapizurabepol.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/32866917013.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609699ae6bf5e---41724733955.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c25dda60---vijusonuborobijo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fe251c446bc579385e46c7d2eee38961/panodadu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcaae7f6b---rizejigozomawomigiso.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609307ab22e34---wadesinilibofuparoputiw.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d3dc5adb87f750326e2a96cabbdd9d84/70800728523.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1babb63b3---xulenuvurofe.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210620182715.pdfIn PDF document text
    • http://accronline.com/userfiles/file/25135741077.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/nepedulipuwopevimitozi.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/kumaruropemagutup.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/4687164570.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8c0ac8b8---77221750405.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/01c692799a18da4cde9cc24e00e38077/23448786934.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/80244444710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+facets+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 16552 bytes
SHA-256: 48293dcd0d1fc88c394fd5e4d405f5f3971866274935dde13706fa7a6c3ca615
font_01_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 20116 bytes
SHA-256: 424732c2953e54dffec9a79b41c7479d07ca53f708435ab88b7e4402838eafb9
font_03_sfnt_off000134dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DD 1896 bytes
SHA-256: 67ea1f0a2cb786692133192470ca2d484800680403d9e04af7b0be12ad9aa278
font_04_sfnt_off00013da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA0 10508 bytes
SHA-256: 84f9768704fe31cbfe7d89becf4f5e43329792c9302d9c6dfab700a8e7d6eb98

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