Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c779280471eb009…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 08:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79cbe7106af1c4096435a3e37d95d132 SHA-1: 80b214222406bc4f4fff4a662f62fe0445c185b0 SHA-256: 9c779280471eb009aaeecc79ef19efcc118b834458fb019543ec1942f110bd06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://fulepmark.hu/nyebu/fulepmark/userfiles/file/puwufadukatogonawil.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/vmv4f2ot4u860q2isabmd14t6f/xogisid.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/4940197909.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f45a8540c---nexogulomakamagikovid.pdfIn PDF document text
    • https://alpinashop.bg/files/48219436199.pdfIn PDF document text
    • http://castel.lu/userfiles/files/zamasiwumulekeridu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/932871e8514179ffc8df08523bd107aa/15658153428.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160970cbe6e372---94598409492.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca6a9d940---pizora.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/20115473830.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/891de2c9e9f0a88816070991a9aa3dab/79369825421.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/joxuxijujomemabusekumuf.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6a8b9548bc252c38891db27c78cd3ec0/80556477229.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/vazowok.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/80255922786.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/rifaniwofuseputagevek.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cae4832342d89a7e3defd9f6a08b4daa/gawuwazeravenoduku.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/nuwidarekorur.pdfIn PDF document text
    • http://podushka.by/files/files/sufopazubavotamaziz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d1f4bd03---mafod.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/gasepamizajofepusikoza.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/74435759093.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2f97be81fb4ee065e9c0522631e205c4/wejesixonolumegupobesodus.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/sozoraxusavujiwol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=imitate+meaning+in+bengaliPDF 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_off0000bf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF15 17512 bytes
SHA-256: e333895b8507f7a3191d0eafe5312789794806ba3522734d9ed00a2e0f5eaef4
font_01_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 10156 bytes
SHA-256: c4ab70a783c0a6e1e190b4423f2eea350168ef8bcd0b6f29a60947c4b9919751
font_02_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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