Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d7422080f2540f…

MALICIOUS

PDF

87.3 KB Created: 2021-07-12 23:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10cc4f7dc7fe8b265d3b2b9f25c2d392 SHA-1: 24ee9929a82bf7729ee2ff8991f7f9503df06b91 SHA-256: 59d7422080f2540f05136447359a3b09d948e09df8f7a1f6b3f6f0413b30b08a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://csc0311.com/userfiles/file/20210620014945_8stdkv.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/st0r9r4u3dqrq2fk2kskbu6k02/dufimigobavev.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdeb420a42---vunekemi.pdf
    • http://www.tekkoo.net/images/library/File/67426952919.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/43978356303.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724ca845529---76192304845.pdf
    • http://www.iece.in/userfiles/file/komujifeguwo.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8c98bf05---mijot.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c770fb3ed0---23656763445.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/91ae21b5d758a0ca41a52227062d7e44/56968473729.pdf
    • http://lubrifianti-auto.ro/files/file/8391941439.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8079ed0c5---7537833845.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162278715224.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/a2qh18kijmmo7d1aurj3nk266s/40004644088.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+vampire+diaries+books+read+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ef.bin
3e267a5a7f7c1e6bdf821ddb37917bf95faa11c564816adbb601916fe0023037		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 16988 bytes
font_01_sfnt_off00011fb6.bin
e23f8c0a775cd9b4f7a8251eb40ce33ad10b36afd73223183a0557f8cf4c4ad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 10924 bytes
font_02_sfnt_off00013895.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 16792 bytes

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