Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af3cb26bd75141f…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 20:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97ca47681c318ca1167773cccade7c0c SHA-1: f28e33b7252fada500158508dc34c91e29dfab8c SHA-256: 2af3cb26bd75141f8467079a383b7287fbd0b2fda33e9da6427c35e3683a6654
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nomylo.ru/uplcv?utm_term=naruto+impact+ppsspp PDF link annotation
    • https://keyseries.us/userfiles/file/fonuvabuxuretoxi.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210907_135049.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/82997283904.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/bonub.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/75758859570.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/tafemid.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109130252119790.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/vabawugejiwifev.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/76660558814.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145d2fd38ddf---duxuvu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe7f3bbac---xulusotasibomu.pdfIn PDF document text
    • http://rem-proekt.com/f/file/pisabik.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/91869503758.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16042205671.pdfIn PDF document text
    • https://ever-progress.com/upload/files/dilag.pdfIn PDF document text
    • http://inistor.com/ufiles/files/kifiwasulifunal.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/sogulomezon.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/61209653735.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9a4f5b2f0ced1e0ce1d95b570e3fba0c/40503742914.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/jelasas.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/728857010.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/36118287824.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/muzabodejupaganenojefor.pdfIn PDF document text
    • 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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 10328 bytes
SHA-256: 282889850278e8b7cdcbc7ced3e651e08ab263d25bf74cb6134aa79eb572b54d
font_01_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 17560 bytes
SHA-256: befcbfe47be548e713689e89e42db6a8da26d71e31a430f99de806098617697a
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1