Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6693a4ee82df561…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 02:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 721fc6a49c2f0361a912dca228bf1368 SHA-1: 2481115775fabb5db31d6a931a12f497638f653c SHA-256: f6693a4ee82df561d7432e3899248edee99e2fa794b88414568287d3ab87ccc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload storage and other domains suggests a link farm designed to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0467e2d560---misejewafele.pdf In PDF document text
    • http://cnokorea.com/userfiles/file/97381669284.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/9752207965.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/dawawojuxurovufinifutaxo.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/18798845518.pdfIn PDF document text
    • http://matras-devison.com/upload/file/nezudoruz.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/vafunenitaromowa.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0c57de7f1cbeb429f676bcd97c9f739e/jusalanuvizusigimugunafox.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61200e766833f.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/kadurije.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0cfdcf08---kumomovirobo.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/kiwupawonuvazituxoliz.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/rufuzurojevibopozele.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/80265988459.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/vubawogixepiloxadori.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de93f6b8eff---ripagopizijutel.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/motimudojabo.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/xomijowizoboregifo.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/meloxinemosalud.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f274f1c03a---tejopaj.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/89367844609.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/51699466408.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/lir6193dt47nfdbf2espjuii45/56543989204.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608720ac876aa---sebemuferowojuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=upholstery+fix+near+mePDF 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_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 17532 bytes
SHA-256: 6fd791622b21185df9e1ff25a44078566d4926a238b32ea28383625b3caf8fb0
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 10848 bytes
SHA-256: eb569b0cf4acadf9802909a7d5f8c3199eb1fcacfee3382b820f7223f50f922c

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