Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01822ab76c3d738…

MALICIOUS

PDF

87.3 KB Created: 2021-05-05 13:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e7ef084a9bb0eaa93ea140e40d3efc0 SHA-1: 8863014f829a2b64821a3f4d9eae01c6d7eccccf SHA-256: f01822ab76c3d738b4af1d4adc1af6b661c3586d3f47d64e8aa4a03913034738
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or serves a malicious purpose. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7998

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c402295285990b8e00ece11bfd80808c/36290700951.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b54ee21fb---jaduwazigabumorubobaw.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b854cb4ebbd07ad635352a65397ef63a/25997869850.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160833cc10ba28---86805030442.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3fc76245---tewetisovutixe.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/2ce6329a98af473c8217e6f66c880993/24473550341.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/t7hlagm48p20fuodlckcjbubo8/91106870247.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/087b25ec325d94a42687bc9caf8f457b/36642820350.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074619e298aa---34204232568.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/88ac1aafb8e9309ace208ab853c07848/tesados.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/65braem7ro56kq218vossgcl3a/42791958005.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc59c41349---ruwizazukaninubojineg.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfba21273---wexebirubo.pdf
    • http://anjilh.com/uploadfile/file/%5C/2021050217065317.pdf
    • http://adamlegal.com/userfiles/file/6087441416.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30e69d35c---fumofolitijojogefojufiduz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=basic+c+programs+asked+interview+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011672.bin
e391ff4939acd475fbdac287699c43620fe55216db4d976e51134bbd44d69a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 5496 bytes
font_01_sfnt_off0001290d.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 1800 bytes
font_02_sfnt_off0001319b.bin
777ff069f485e30640b5bcc5ee248c774d1b479c521cd6dd4cf413c79ab2d7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 12228 bytes

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