Malicious PDF — malware analysis report

Static analysis result for SHA-256 f594a94ae754e0ea…

MALICIOUS

PDF

72.2 KB Created: 2021-05-13 22:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cda859ef212fa7ec6de4811adc62b08c SHA-1: f63ad4a3d4c7b932bc1c4eba51f9e5c365647793 SHA-256: f594a94ae754e0eab786fdf36c70b782ea850f53a8b9719bf63f8547db0c5f45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a worksheet, likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFNoValidXRef. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/75cd507ecbcb3a31d318b86a75033cf0/73663890531.pdf
    • https://betalinktech.com/blmedia/file/61283447111.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eddc187cb---74858298100.pdf
    • http://akinmedikal.com/uploads/file/sawikafezuxu.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d2f14572c---92701365978.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d64e9eb680fa4bee3288b1844ad6f728/26376587712.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/48c1a8ab83d59997046ef39d6151d04a/sifomusibazozurenusot.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e3ee5fc7e0c8b9f5ee24199dacd3aab0/regujutopisurigepojat.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607037d95c1d8---gamosoxu.pdf
    • http://monkey-do.net/userfiles/file/80407539212.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160869b5a8e51c---xawovawisexazozoniw.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/86578b1a6785df83b991767a3fd8eab7/88587795033.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/jt3kovcsk19qr03qsir5jcfjo0/72732183222.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/26ae9c99b9968177866020b2e201e09e/9666641783.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e21b28317f---91599345456.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f262bae7ec---pevumidoso.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774bf249d41---64337753533.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160795a32db79d---buvisenagamipuwapetuwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=present+perfect+simple+exercises+worksheet
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da67.bin
e13006566492e6257dbef4b09ac8ceccf40a026a53289fdef2fd6cbc1d5bc829		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 5056 bytes
font_01_sfnt_off0000eb70.bin
fa28cee7cfd8f93d0c070f019b023891072a405c037dfdbef9691229e05e075c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 10432 bytes
font_02_sfnt_off00010f26.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 4324 bytes

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