Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fffe67997e43ad2…

MALICIOUS

PDF

71.0 KB Created: 2021-06-19 06:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 05014f0a519398ec27ce9bbd978c04b8 SHA-1: 9a9db991350c89ab364076b0755575af33f17dbc SHA-256: 1fffe67997e43ad2376958bc2983d42557de3d94f19cf068fbb21cef136c2d01
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8726

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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/454c39758a132e5b9f8112122d694244/wojabogezamulej.pdf In PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/13945733591.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b11363f25fc01f28199efabdb0b2e76c/kabaweromekoxusarum.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/43a341b7acdca1392ecf9b5a874a7f7b/81372521743.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f5a55ee8---44562810592.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/dojidudovaxosajem.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4083e0d5691dbddb49b24b683e94b966/xirawenixaponip.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021051720050888.pdfIn PDF document text
    • http://aps-mes.com/files/file/pololik.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7c2658cc---kimelujo.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/8546009918.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bca9c25950c1e793f15e9be5b5ba7811/rasejodojagubajumali.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/subujasumaboviliv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607186fdaf6ae---99748502050.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/vaduxovunomukoboku.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5f1d3041---tidakuwoxubuxejodof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=introduccion+a+la+balistica+forense+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 5224 bytes
SHA-256: c442520e7c4fec104061b75c8c6927709ac02379964e167d3e3fef99874599ff
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 11184 bytes
SHA-256: 29d9c44e1775944dbc1b35d4d63d24f0a490d8217050bed691c4fc296ceea928

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