Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad23645be3d23e8…

MALICIOUS

PDF

80.7 KB Created: 2021-07-13 23:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2f98e135132c6f696579b197c2a73f04 SHA-1: ec2889b96e390550b2f2f82a59c46b2c22cf2fb1 SHA-256: 0ad23645be3d23e8aeea8456a98a0f3d2c939aebda126f281d3073139220a650
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 a link farm pointing to compromised WordPress upload directories suggests an attempt to host or distribute further malicious content. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55ec3ee22d---kupibirex.pdf In PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/d3f172f0cdf4aff6645cd5e0ad5f697d/15752223595.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/gitabedigapebewutez.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160980c4f0af99---5235337325.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b8d4e2f38c6e67846edce54857fc3c63/33149484821.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/jezibexenoxugezowokoxofuk.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/46479527803.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a7c7446ed---pimorufosakobedez.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/85936887605.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/zizoja.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/susibuli.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/1a25d54317100e99f2efbc5e979bdece/pisuwosuletafe.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/megojiguxemoxasuvivoga.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4kiqg3isbndc3rlk4050r67nq7/dubupejur.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/78dcbbd6005eaa54f10dc3ff627ac342/11300555413.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/90b1dbde1e336f86c3b111a3c033c080/lelipawonibuwuzofi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0250c89cc8d495ef6679c6350f50c5cc/rulavetemifa.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/tutikidevujodubugu.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/xidet.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce16eba929a---jesefod.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/26018389673.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f6e5b1d2---lolozuzibupamiwetideva.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/rmmi2cfkgj8lgaukiv3pd931o0/xelasokewofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=jelly+playing+hide+and+seekPDF 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_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 10548 bytes
SHA-256: ce9b85a350ea08ed3d71d48c1c037ab9a5e0a72b653ed764af76fa8713ed4189
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 17180 bytes
SHA-256: a5e61ccb7fce14b967b780a54ca436a4c02d16aabff6ecc904b3ff6d284824eb
font_02_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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