Malicious PDF — malware analysis report

Static analysis result for SHA-256 f954162170235491…

MALICIOUS

PDF

64.0 KB Created: 2021-05-24 05:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d8eb533e0f568f4c7eaa70b3a7f939b SHA-1: 31177df80c63a7b6022fc8c43a9e8e2352fcfa6c SHA-256: f954162170235491a01c0aac8acf60ead6f64ecd45b2693ecb4b8469cb3c7398
154 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to distribute malware. The document body, though heavily obfuscated, contains metadata suggesting it's a worksheet, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8461

Heuristics 5

  • 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
  • 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/1607d07a25cad7---vemujufikatidewisajogurud.pdf
    • https://iamtimeshare.com/userfiles/file/foneju.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/55afc7f86caffd92b6302b6cbbf4cb7a/60322895121.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748ce1602e8---zupukesizewidibona.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67569afcb---jenodotel.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a20a85e42a73acb1e4edd854390a26fb/35694454892.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609476413f5e4---22668727995.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb496c8b6---masiterafexelokatez.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160707981939ba---99436011964.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/eo5me9k8q0goblj7618npi33d6/54964064081.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e4eea790---gorujixiwoguxifele.pdf
    • http://lubrifianti-auto.ro/files/file/jukeja.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n2j9ef6ggun95h8e4df2da2sf4/18098066935.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa4d08fb9---semimevakilu.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b676e297c8---82547219480.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=algebra+1+9.3+b+worksheet+exponential+growth+and+decay+answer+key
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31e.bin
cf46bc3be713bbe6f7a3ac04f79394e31af610b028fd992b9a39973bf58850e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 6196 bytes

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