Malicious PDF — malware analysis report

Static analysis result for SHA-256 6665f366a9a1f8dd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 19:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1276bde413fcfd5f7e524e484558afde SHA-1: 8cfa839d27ccea11db4e81f9a445b7e9d05fb5ed SHA-256: 6665f366a9a1f8ddc15f1fcb503443035fb9afa2dbba5a8ca2301d7bcc20a445
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://w-mill.jp/images/file/63339948373.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746cea696da---lefadivakokadijamesuguvon.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/2107566808.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/robupupuzisitabil.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lopitigesedajar.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9l6hgvk6kv2d2qnvu4pd0tm6s4/wonegubakupopubezuf.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/defivux.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/78343162910.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16125588814fe5---97016915111.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945ffebdd5d---10973021905.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/92458472662.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609b455af2edb---67423186465.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/kejeni.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c54072d43c---luzure.pdfIn PDF document text
    • https://geniodelweb.com/file/nokezupobafobuvurajuwe.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/43b0e6dc2d84c335739ddd5fc74b1750/nuzokodokuxumozeduxisizig.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/pizaxaxewiwozusajin.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210719065002197.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/jogot.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/16710172359.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/01776s7523hlrc54eco8ih4nlm/19076256738.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///14045063652.pdfIn PDF document text
    • https://luminex.pl/upload/file/75190071479.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/79061323972.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ce7f1f57c64c887dc9883ee7248af857/vewunojoduro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=disney+ukulele+tabs+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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 10716 bytes
SHA-256: ec4870140f401101ca69fbb523e0926733583fa615f54ccdd41fdc0ee975b309
font_02_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 18672 bytes
SHA-256: 0af54e4b6420ce2a80dd5aacd45f2f0393df962b2341b769608a0ce9041cfa42

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