Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50efdfcd70cb59e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 07:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b0a16f982d167592c16225b5b4f8263 SHA-1: 9e66ca10111dc757a346cec6da132d2d22c5f4bf SHA-256: b50efdfcd70cb59ed20afb62016f83fb6eaa411f91c91b0a0fa6d221c5da32d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness, with a high ML score of 0.997. The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c95e54a9802---25346309246.pdf In PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/45897531828.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/78246827282.pdfIn PDF document text
    • https://kham.vn/userfiles/file/73487384541.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/mivijatan.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/texizerizavuzubof.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/nibixig.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/sisixebipokikipegakeso.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/rukenafapowopibiwizus.pdfIn PDF document text
    • https://33mobility.net/uploads/files/46475019694.pdfIn PDF document text
    • https://digireg.it/upload/5286524113.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1c3dfda0527ef632c6abca55b2b9742/62817270818.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/69402879726.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/98340717748.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/bapumuzebolatidizo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/nosufipefofofilediw.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/30931921995.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9og2t8ctelbo735b6iuogv0oq6/57219040270.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f47178bae96fefad5a237b92c7602794/ziwogevedujetupulagid.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2666e9085---31825940107.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc2e12703---92923890623.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aad83887dbc---gekiwazudodejepax.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c218ee6748---3845244722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bruised+finger+tip+for+no+reasonPDF 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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 10780 bytes
SHA-256: 193f81ecd10ebd6c7461c79fcda47bc99c72c9a57d08143dd2da6207ff911f21
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 18060 bytes
SHA-256: 75d9de3b3fcb92b05c1aab12b4fa697069df78a87b7547d131262469be85b5a5
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.