Malicious PDF — malware analysis report

Static analysis result for SHA-256 a895b4883c4e0ca2…

MALICIOUS

PDF

54.6 KB Created: 2021-09-27 15:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9120a62b4ce8596ee7dd67fd946a134 SHA-1: e3326843d2885eecdbae30aa78b0db2ed5b22dc7 SHA-256: a895b4883c4e0ca24203acec33d3d3d66f9d45ad384a310aacd0e1c8b9bb6865
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains. These links are presented in a manner that suggests they lead to downloadable content, a common lure for phishing or malware distribution. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6660

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://malir-naterac.info/UserFiles/File/72301708790.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145591ca6ec0---36370848078.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/1844257164.pdf
    • http://seosanhrd.com/userfiles/file/makotuwarapesubi.pdf
    • https://houstoncoinclub.org/FCKeditor/file/gixavalojexoremukija.pdf
    • http://jshtextile.com/UserFiles/file///fitukirorurinon.pdf
    • https://activepymes.com/pub/file/gepivulavom.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a0f681ac---simitozoju.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/58363906840.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453f9977910---11253898643.pdf
    • http://boschvietnam.vn/files/usersfiles/files/14738698625.pdf
    • https://betenagro.com/sites/default/files/file/gipujo.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84e41d50a---lazagasa.pdf
    • http://9y.bfage.com/upload/files/20210921075244.pdf
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/24714619813.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/gekiponotejokexegilixojub.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/254c1e575032ec326b9c4e66c2c61725/romuxugejubosuwinizipidad.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/guredeg.pdf
    • http://huabulaw.com/uploadpic/2021-9/file/2021090500564673499.pdf
    • https://divanich96.ru/admin/ckfinder/userfiles/files/47370823659.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/54981788194.pdf
    • http://geerhannutpourreussir.be/docs/upload/files/81010503149.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6b18d3e50a88bcdbdeb34a3af193eaee/38111192817.pdf
    • http://kleinschadenexpert.com/userfiles/file/21920513069.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/27830440585.pdf
    • http://turbotechnik24.de/userfiles/file/68439456145.pdf
    • http://milkyway-vn.com/upload/files/21926126926.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+sniper+3d+unlimited+money
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b423.bin
962df138a25c7071fd9a5d0f7810d21486895ce91f8b676882cb671928f952e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 15156 bytes

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