Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e46251f6b578d6e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 04:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08dc93f3396c1d05c579672a34effeb3 SHA-1: c012c09c59692d38ed59678630dc0eadfbddee71 SHA-256: 3e46251f6b578d6e381457795ceb2ea8f76e1a3029ac5269901f0249b3b79b2b
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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 http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/gabodofokoviguri.pdf In PDF document text
    • http://investbuild.ru/var/upload/file/zesuweniwawalili.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/55521190593.pdfIn PDF document text
    • http://mextro.de/upload/files/35989115841.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7eaf8218055c9d67ceb8efee5738e5a6/buzufivafulukagunaga.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607153a742b56---23519320814.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3efs9651n7a7qd34ccvnh4ve10/tilowudonofilipevi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072b973cf9e4---kaxudulibematira.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3b2bcfe7df9623e1bcbec9eaf2998d1e/jowumurotamekajex.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/80565436643.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/67155198887.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b78bfec7913---89767940606.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kijavel.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/44245055665.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e1887ac52b2ab1d9d3b3b52504bc1ded/30373637543.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/bekifajofalus.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/56950739941.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/kopoji.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/susexusamekuniwonefo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/595fb80dbc45ec79b2c1245773b6657e/30687121759.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/94347883000.pdfIn PDF document text
    • http://castel.lu/userfiles/files/45805890234.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/dasidorir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=zwitterion+structure+of+glycinePDF 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_off0000b9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AA 16404 bytes
SHA-256: a424a4e37634bbf33f429516fbf3be79c8b0d0cceba7c1d94b2b3b13326d15ca
font_01_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF6 10612 bytes
SHA-256: 4dc82eb4a0b337c240304620c31dd5b70f63156097f1fbaee740956258fd5e20