Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99e4d45655cd7a5…

MALICIOUS

PDF

90.9 KB Created: 2021-07-24 08:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8939d502a5073441423add3adfde438c SHA-1: 323a8bcfc15a6b0271b4c8cf6fa0e69ad903747d SHA-256: f99e4d45655cd7a5d7a4648dc5e09c13acbe2797d7cda14bd47d8649706c8c8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to lure users into downloading and opening further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://kuepancong.com/contents//files/11761123730.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c096e0c8---72032955899.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-16/20210716041446743664.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8857a3f01e66942262b80fd8ecba336a/lafenuteduxoratewedodoj.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/68690084830.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160917acf4a62c---xonaje.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/70528779799.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d538c4d4a---99693152096.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210528_61E2523A90A8BE4A.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/17212213330.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621393494.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4iv7v0ia1lq4vvdskgihmjt7i2/nuxagiresavedinuruzepun.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/pumitorigigejujatewupi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608552c5a615a---gimexibo.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60670969786.pdfIn PDF document text
    • http://24cvety.ru/upload/files/voripafapikomilotoxakas.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb008503725---1104329754.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/790643c5312a31fc4bcc0b0fcb068f27/981963395.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1e0a08a16ca4dc73bc093891e53de49b/33378729080.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jejegitazer.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789e7594760---sojikigitanetilinijibi.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/53509525279.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072152162269---8259692461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ecuacion+dela+recta+tangente+ejercicios+resueltos+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_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 18236 bytes
SHA-256: ff5b9a0830fc241bbcce72682bc3bde122c481bae3a5a90f7c0487c5f61e4f04
font_01_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BD 11008 bytes
SHA-256: 821fd6565f60fb9c59764f4d68b9b9f8d7fb824835c4fdc667e6ece2e753e4d0

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