Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94e383776b7dea3…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 10:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b901b988660af5533eb9440e35a6fe65 SHA-1: 3f89d416909aa95f47656386dda9f8e1e2950037 SHA-256: c94e383776b7dea354a2d11e73c204d0a83c57511001762c55ff16b45742ffe2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bongkartuantakur.com/contents/files/kozerikujitoloxazas.pdf In PDF document text
    • http://kramor.bg/userfiles/file/livufirimemulepu.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/78748103285.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/monizorez.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614568a692830---42762595643.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/tosedavibasuma.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/17198499747.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5212f9fd---dekebefirejuzujogikam.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613784ebae7ed---nanepadosolanejovi.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/37850961364.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdf845b631---17917867542.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/xatemawinirisure.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109050252293316.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/nodifunubomuvixi.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/bezudofadefuwid.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/64377967163.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/46051394069.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/jusugov.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/dadoxomavolu.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/91528013440.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/renidajinimajevukuxe.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/47877961459.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/ragubovu.pdfIn PDF document text
    • https://renetravel.ro/images/files/kowapawolamijeroposetub.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/54755369274.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/60842263128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+green+inferno+full+movie+watch+onlinePDF 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_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 10828 bytes
SHA-256: f2ee478b0b0ca38ba1fe25aef2affc1d2f2a72fe9b3e4116846032de2d22966f
font_01_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 17332 bytes
SHA-256: 5a127c7fd8a760e23c0e116af3d8e67723ab10edb647dbe50c5b792f8555822a
font_02_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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