Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e62b0663e9bc216…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 20:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 617f126bfd0f113f80a5ba7308a260aa SHA-1: 28de81ad190d14a333b2f7bae8f3f0cf16da7e33 SHA-256: 6e62b0663e9bc21688575304827404afc1bf71f5e7c0dfe973675e1a7c5c4c27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=sweet+dance+android PDF link annotation
    • http://antichigelsi.it/userfiles/files/22537211874.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161401a6edfe6f---jikazemugababemexomu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/89231e7b5db05fdf1589e5d7dfa15439/zogetuxuwabelalizogibuxeg.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/74342907849.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/48158911412.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/17166467073.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/mifefazata.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/bapipivesaj.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/80021159562.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/49825544632.pdfIn PDF document text
    • http://01host.ru/userfiles/files/zikovulatonalixonidekij.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/xudotiwewa.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/98678100050.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/rufutitigugud.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/popifatosirekoxumur.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/gomixutisubezulesifo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c6b765283664dc5284ff4dd37940cc6c/26716014196.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/72050553713.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/16277068163.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/9386981352.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/dewimefuwubaxax.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nagozekexirosujugutefenem.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/kaneposewi.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_off0000bdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB1 15188 bytes
SHA-256: 7d912871d9e965c3720e36e3c37d8ad3221deb1f5829380591bc28acc567d54a
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 10308 bytes
SHA-256: 926f0f2c79446446b797993a7d67d7cf9ca6816afddfa8925379080cef46ea9b
font_02_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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