Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6b262283655c0d…

MALICIOUS

PDF

82.0 KB Created: 2021-06-13 11:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 416cebbc5ee2123357de9de2c17dad86 SHA-1: 5738d500d327ebc6f7dfd4252cd621562c2ae343 SHA-256: 9e6b262283655c0d80aad82d62adb00d5d006b0bcc7b90e64d9553c5e75edbfc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata related to wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9548

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://catamma.ru/uplcv?utm_term=short+shrift+passage+ielts+reading+answers
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609cfd6976c9b---fuvekakuxekeguwoze.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48e3c4fe1---29239872845.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/49937438599.pdf
    • https://blugarden.eu/file/minawe.pdf
    • http://keacg.com/upload/files/15047725879.pdf
    • http://www.centralperdana.com/file/18737629319.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607436efc37af---95802463136.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/350e1c0231d8cb2b1bda56a7026b2617/xaduronodazozerob.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/84552883144.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3941ecdb---68620895650.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7c05212ec99b7709c2aa553f549ff791/dexepod.pdf
    • http://mu-rrrc.com/userfiles/file/dijazexi.pdf
    • https://ahreco.com/uploads/news_file/davikakevusegitufe.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9ee8d150---39990979683.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8352a2851---budetawogo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/74itvnqqqjlvfa0e9frbm92at1/29693674558.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c77.bin
dd66f41c5faf20d7bccd2f31e7df8104ce8b7cad08da50eb90096bcdeb3bd585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 5500 bytes

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