Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be90e3a65733f0b…

MALICIOUS

PDF

93.2 KB Created: 2021-06-25 15:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2295aca842e6cc06079e3bb786129ce2 SHA-1: caaf64241567bfa509914e2ef15aedf8171cf891 SHA-256: 7be90e3a65733f0b1e8a8f90487be470709e11b5854d56359751bdc7e08958ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to websites that appear to be compromised CMS installations, specifically WordPress sites using the 'super-forms' or 'formcraft' plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/382922c7dc7e66a325fd6bfce2a7c56c/masopatomewoguwijukowude.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d216c65e6---63983362487.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160961be2d3c20---24010999234.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/26987046f6be46cc3890b6f92fd296c2/tuzusasapoke.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c795c063ae8---kuxoxetefufezati.pdf
    • http://scbczy.cn/up_files/file/20210606_062229.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/lewazupason.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b02ba85f7---wazoduvivogojuguvepar.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ac0f8e152517396a80523d5f2775111f/xisuwomegobevop.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33372258e---vunatazid.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/u7t198f948ek2ojf3s5lsf8kk2/biledizixodiridorosewug.pdf
    • http://buddhavehicle.com/userfiles/file/95622651151.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c7f888dd6ea1286ee82d07795f50d39e/rarululu.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd8f98097---fomotu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=down+in+the+mouth+idiom+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e20c.bin
6271304cf0d171f13314d004ed443cf6ac19b9c912f599abef2bd06d0745c0ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 19504 bytes
font_01_sfnt_off000112db.bin
9493fd1f3c6eb0c66284a660c6e4e288c6c2c190f298881f6409ce3c50177342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 11172 bytes
font_02_sfnt_off00013638.bin
572c6619f93d279ecfb41259eac0859327445c54ac5083e3426d2a07010731fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13638 10568 bytes
font_03_sfnt_off00014df4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF4 16792 bytes

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