Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ea1ea1b025a23a…

MALICIOUS

PDF

68.5 KB Created: 2021-07-01 14:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9380b5190fddf36be142d770e932eea SHA-1: 972caeb2623e3690040ba2e4753b39199aaf3bba SHA-256: 37ea1ea1b025a23ab5b2b544ee5eef2faf483b0a5b063254ef7a05d2b8a69763
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7907

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 https://chcial.ru/uplcv?utm_term=read+the+following+passage+and+answer+the+questions+that+follow PDF link annotation
    • https://ocw.tw/uploads/files/8633228768.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/58057130593.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ropejafebozenojikanego.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/resuxewazawe.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa29340789a---91657459276.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ef5664455d7d3a499e576e9fe11ca9f6/32671483412.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/jexapafizowajevaja.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d0hbm23s4v3cq6um4iqpg75ic4/18743499983.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/boramumarazufodixoze.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/gofiwo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/cp8foahnhoek1ifhlh5rikp393/8107303513.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160800eb5da0b2---lifofojumofuwekufodasum.pdfIn PDF document text
    • http://www.heksan.com.pl/file/90594683920.pdfIn PDF document text
    • https://andrejc.si/files/file/pijegowulawagawoletelekit.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/43013356980.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/87854252396.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/fowoteluwibazerilize.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ecce0fbb8f3767852675114bd5fcfa62/6293852397.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca89248bb0---zufekidakabubigixa.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/63215928843.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/13439209471.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dacf03b9827---besofovapilopexivuxis.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 11156 bytes
SHA-256: 424820d43049d068c3d67595787283b52c8777a6809edf0e11f96bdfe3eb427d

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