Malicious PDF — malware analysis report

Static analysis result for SHA-256 354a98957878e477…

MALICIOUS

PDF

68.8 KB Created: 2021-08-26 09:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d1aae16da053566f90b5ec7aedfb053 SHA-1: 892596eb7815a3cebfe6428db3c203ba72aed0aa SHA-256: 354a98957878e4779ef9bd0d7bfd58782bb82f0aa59ecc55310c0bb35a274091
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and link farms suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9032

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://oniceh.ru/uplcv?utm_term=icd+10+code+for+chiari+malformation+type+1
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f8f157b0a---fexetijol.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/54477172830.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c7b9605d---55560184899.pdf
    • https://www.abandassociates.com/ckfinder/userfiles/files/72851054042.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f961058d5---wozodozevuxalilodeda.pdf
    • http://rosabaum.de/web/editor/files/walik.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f246eb1d9---vujuvulo.pdf
    • http://werder-ritter.de/UserFiles/File/82211266728.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cdcaec3e4---79000090798.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ade444cbdcb---44085866254.pdf
    • https://baobihungphu.com/media/ftp/file/80707360845.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b546cf90fe58791c2792066a1751e2f6/61139095617.pdf
    • https://riwg.in/userfiles/file/ratezekogirasajadobusono.pdf
    • http://ergakiland.ru/files/files/wavuginowonegixa.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0f536b953193fa788836f57e2f873bf0/21866437252.pdf
    • http://www.ecostroyservis.ru/File/fexoronom.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/jatigizam.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda49707ce4---43692055154.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608edaf7814fb---pagilifamagube.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/wepotobitujemetom.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612399a8bbb12---59271176416.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/fa92e6540c553246ebbfff6bb7a79045/rotapovovuvogidexepe.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210716_F8A5E0BCA980AC92.pdf
    • http://akcjonariusz.com/UserFiles/file/duvepemagurobuw.pdf
    • 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_off0000f714.bin
9aab573362110c087ffecab5f8d5c0ae5c6cbc2e80c6a6157d80054b2e83f529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 10956 bytes

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