Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2114e7682faa5f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-07 00:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7b2b2f43a3754b2f193c53f26d1e978 SHA-1: 9b288d8bccc1dd3c15312357bc7b9563dbb2745b SHA-256: 0a2114e7682faa5f4bbd82ffece24c5479f14678cb8aefe6c4e538b1cb64b814
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also features a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and potentially distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bbfederico2.net/userfiles/file/mixilunisanirapudofewopu.pdf In PDF document text
    • https://olterus.com/contents//files/zozekugesijujigavex.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/zurosubub.pdfIn PDF document text
    • https://ivanamihic.com//files/13019871104.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/25862319446.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7c06aed17eb50218d20b8d5c406773af/wulobusebesomibukimoj.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/tikelar.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/gawakageteson.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/00r36fl4ni05eo46pqav8uheu1/6185286185.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/518c62cfb37a1e62b7874f484b632234/fozimexoxisuriri.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a7cde540---xeraro.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10c03c590---norusuxowunopew.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/40121239121.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/weganoledevisulelonejesap.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/kukomuxasenozib.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6d04d9cf---jevafij.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/kevebamagu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb9152f95---89920264791.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/vufexoxugidubimitoxeba.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/napuxarutozubadadozem.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/43603111716.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5cd847c486d507f3b4ebdac1a28b5f38/fosogarage.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a438007ff0---46210742814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=boi+salary+certificate+pdfPDF 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_off0000b62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62D 14356 bytes
SHA-256: 29e20579746c51b7ad2bd58f44a9c4da36b0bc0d98d01b968f7bb19c2774a8c1
font_01_sfnt_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 10676 bytes
SHA-256: 1cf745e644e2191e5304ac960e31e8cce94ae5ed8a0d5493cb5cc27f8f90129c

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