Malicious PDF — malware analysis report

Static analysis result for SHA-256 caae574d6366d195…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 18:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 329d63bb619ee3f5b2b99b90e212e5b0 SHA-1: 64717761dc17699dfc29a9804f50662673505077 SHA-256: caae574d6366d195a0307e48ee88f81d2bff465565779c596397b19c9e7463c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it is part of a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/fodisime.pdf In PDF document text
    • https://alixdemassy.fr/userfiles/file/jezefejapunenetewi.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/nejofozu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2a356da21---66721997759.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/29399295381.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/74189456209.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e40090da---50525962667.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/16519260024.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/82241632576.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/83727332418.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/tafupozevawe.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/nowaniwavufekivuw.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/bilapogedumus.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/60673626464.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614690466c99d---21967508122.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/pevawa.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/jejeluxexu.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/43122366124.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/17990248763.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/rutijogozukadelurokivir.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/livaz.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/17332288686.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/fuwux.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161327e875662c---96786070938.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210921_150042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=barron%27s+math+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_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 17832 bytes
SHA-256: ffc3313ec43c8376728ebb08d49a864099b21f2d3244808f01b555f65891467c
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 10700 bytes
SHA-256: 699fe676ed1b9aa442bb604b76676e7413d6cf32be509234daf613eab8a25e99

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