Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7f4507a2acad88…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 07:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb4fe2188bba9b480d420a0c6ab1b13b SHA-1: 46f00918bd0664ed69292f9652b1af6e822d6ccb SHA-256: 0c7f4507a2acad885aa85d7f0c2ca7f33729d4ec12b6ae4b225e1de49cdbef98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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 https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b42d8f65---23470683302.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/80jc8k7l7vdd2g9mhp7tsobvkp/bofagur.pdfIn PDF document text
    • http://xenangheli.vn/public/files/pugofi.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/35153181649.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/75905915462.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/wuzagulumelas.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ef43ac1e2944caaa2a18cc70f9e103f2/57237892187.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/67206056789.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/72672750681.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613409d6b1123---25558406579.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0879e93e8aabca009f4e5f58ef0c295a/xugugitev.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c710c4e7cba---73503631297.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/72624646120.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/19440569790.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/513b93047cb93f43da58044a0da64a26/tamofugo.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/14956725425.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/05adf2ef1ab5097ab5448260d29f9553/xetofiwigum.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/8477426554.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/43770839636.pdfIn PDF document text
    • http://machin.kr/userData/board/file/79386118290.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083175146b27---tiguxutopesitugego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=adding+suffixes+to+short+vowel+words+worksheetsPDF 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_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 17688 bytes
SHA-256: cd76734e7a6787e22ad0588e498ac75bba5e0bb3cffa4ae21bc1038df127f3df
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 10900 bytes
SHA-256: ac715867329157923469abd86b2b044b9482a91c5f3f4df32c01b52bcf97e449

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