Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fef094f52836b63…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 01:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f17a25b2d1faf586f5c673392ccaec58 SHA-1: 8363e4e54eb42ab241d7d4d96551b0f7c0b8c25a SHA-256: 0fef094f52836b630e0079b15327efd3e7a44d3eb93f2124b9de4ed9f87dbbf1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of external URLs suggest a phishing or credential harvesting attempt. The ClamAV detection further confirms its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://nacyc.jp/Upload/file/sipawefasegomuninuki.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/69500305593.pdfIn PDF document text
    • http://teraval.cz/res/file/1528912991.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xafab.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd80880c21---30914375588.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/93286075507.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zimafawuguxukoxapibavan.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8d2456cd---49880530308.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/jojabilejamowiwometiwu.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/84859728785.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/rejelerotigedobuz.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5168969014a88cb9c86b60fb6f7798fc/kilarilaxeletut.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021082107575973499.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/badabufixefasol.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd56f00a836---janikozaranojufomiwur.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/17959594817.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cebf50b3163---99154802688.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/94098349257.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/nokipumojuxexojisaven.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/99555735110.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070e68a8ad5e---70161048604.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/729850657f70dfab0583918bc7b09d9f/zurelud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=first+certificate+in+english+with+answers+2+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF2 19240 bytes
SHA-256: 08c59a6700de1a7a076976913257cd5b5a0501309a6e480e265c3c3879b0200a
font_01_sfnt_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 10960 bytes
SHA-256: 6117a030ed276231661310c8c10772f9e29e6ac8d18bb8f86bf0bc5d129a2182

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