Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9352ed95967a81f…

MALICIOUS

PDF

101.0 KB Created: 2021-09-16 00:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1c06f581c5830a4a818cafde386bf4b SHA-1: dc641d238815d363e153fe46b0c80c745cf3fbf1 SHA-256: f9352ed95967a81f04086049fe5f53078f62f422992fca7981f44b7d01a19e4c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it is part of a link farm, with several URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://multiflex.ru/userfiles/file/gorifikowelo.pdf In PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/37883801123.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a5ada53f---28027513932.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/fezujawe.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/19014729405.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/lozexetebatamizoxenisuni.pdfIn PDF document text
    • http://ewtch.com/upload/files/kekixejaxebogigij.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614121c08db1e---mipotivorak.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/9747158702.pdfIn PDF document text
    • https://equimat-cheval.fr/file/judubinigojefadubo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/561f7f925e4247c7016206389534c1ab/ruluxuwezazutetoxu.pdfIn PDF document text
    • http://atrsara.ir/resource/files/39040660428.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/lumisab.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/gegegopuzaxusipedib.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614017ef5e542---mirejugadakanim.pdfIn PDF document text
    • http://mweb.cz/images/file/kufabatatatarubet.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/64473783889.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c9ad2b7---68760776414.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4d1c7be5a89ccb3752cc89499a03d1e4/kesivuruv.pdfIn PDF document text
    • http://vuason.vn/upload/files/70355546293.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/zodasilagojubuko.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/muduxotadapijugu.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/49177511140.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/47824339083.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/37947780401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=movie+box+plus+2+free+downloadPDF 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_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 17460 bytes
SHA-256: 4a3ba7dfc40deed366be0414fec0a363c1aeb96081be706a653c8991b2e260a0
font_02_sfnt_off00016cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB7 11000 bytes
SHA-256: 2800623d1327d239cfe74e6d1d15bb2bbae4bc67b5cf67293247aa768eae7e34

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