Malicious PDF — malware analysis report

Static analysis result for SHA-256 4539bb313d41e24e…

MALICIOUS

PDF

82.8 KB Created: 2021-06-18 18:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0f300812b3f84a13cfb83e79213332b0 SHA-1: 072c730994f412447d77347162e3ee3e76565e36 SHA-256: 4539bb313d41e24e3a5f13011b7e07faf2c8c828d6f40d82907291f3e7c5e345
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a9077563---puxemusaxesajafufazo.pdf In PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/47cb9311363d5dd1fb34fa77140cb599/59269590782.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff18dcdf1f---58683875502.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d6a542dde---49355062833.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/41781142514.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/249618231.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/32100119908.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/84omn3h2q94fcst80g72qs8551/95670471771.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/85e41c2105d37f7339c1eb12b88e7d9f/18583957020.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5a532445e---rojuzinatezixosusipazinon.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092c4350de87---narakuwubokidibu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/22189680902.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b81ea56d5a7e5d645a505d810c3befd1/80988619202.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/zinafuko.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966564ac0a6---totalodejavajasu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cbcec9bb8e21c5b1ec41868bc01e7e93/gibuluz.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/pugiretorawesawewul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=k+project+season+3+episode+1PDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 7576 bytes
SHA-256: bd5d6ad319835a4ff3d08489bfcdfcadb8f6edada75f4a525c9159ae4e00c3dd
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 5296 bytes
SHA-256: bbcec2cd41073586bf16b1521923ea821d173d7c7b99499b4e145fab3969b3d2
font_02_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 1860 bytes
SHA-256: de1e619468daeacde9bbc416b0d145354e42fbc986111aaacf532905727710d5
font_03_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 17660 bytes
SHA-256: 3d6abe158a64c22dc904f892d45107a55aebb1142b60ebd3ff6b12080204ede0

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