Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b18529bc75d944…

MALICIOUS

PDF

63.8 KB Created: 2021-05-17 01:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 463c41876716f918200eee2896b21c9c SHA-1: 8b1daee51d109daa1fdeca922b3f3a31fb14e879 SHA-256: f1b18529bc75d944a5f45ba8355e31f2dbbaadf5c6468faf8f5240fc27b9a39d
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 PDF documents hosted on compromised websites. This is a common technique for distributing phishing content or further malware stages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8701

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baobihungphu.com/media/ftp/file/xifutegofiseximajavujone.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47a93bfc3---91803008862.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb42f24154---fisof.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a11223e91---96875219076.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c74410e86462f3b373a2b04b259c3a41/zamomekovenejogapegep.pdf
    • http://dobrasekacka.cz/userfiles/file/guxenediwimutakikoxep.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/gatofeforu.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/725345b54508b052aa858af9ca167bbe/55587226641.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac76dd49e---85441093556.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160730d0724a88---64644719474.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/998c2d1757eba96a19c4020b1eb7dafc/35809800397.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/49d1d0ed6b1f3a396b410721e5416777/54732207090.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3mfnhv0ukahaqaqfhsdi3338kf/17703880655.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160872633dc797---lotovale.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/3orsm25bor1v5gjnu8k1073epa/jifojokegazexumop.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771a610d9bd---15842613581.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609885b91b507---19253176019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=acceptable+forms+of+id+for+employment+verification
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf6.bin
896de889e2fdc2929228b3863b046b48d1e1ffe9aa80542bfc872fd2c3d149cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 5592 bytes

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