Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc82484229afc2be…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 21:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5757c1c94c733d117b54eb3cd02f9acd SHA-1: 20d4d399b59c47d0be71bff182301c66437c3df8 SHA-256: fc82484229afc2bea0ff790443c939447fd9cdc99a7a047e8a234e327d77f853
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous URLs, many of which are hosted on compromised WordPress sites. The presence of these links suggests an intent to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/okkbv7l48d95bsl3guutiolm5c/46046582955.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/620ac833c50821399d2060ce35aa64e3/bupudiwib.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02e7c5ea3---wusuwuzumadawa.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/nedimosixix.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987426628ad---92464599050.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qrrk320fk0us0dgq055rc088eo/42225396788.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/olf304c0j5t9hcmlb3jrdmbmj3/dujelesapavuferur.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kamemi.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/sefibutuxasebufipaw.pdfIn PDF document text
    • https://digireg.dk/upload/87119451389.pdfIn PDF document text
    • https://oicenglish.com/imagexx/files/lopitumapadedejos.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/94840773343.pdfIn PDF document text
    • https://hagepoorter.be/files/files/wojonetufusi.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/17638468236.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468445ff78---zetefurotewinuvanizewu.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/29433942905.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/96696545108.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25a44439b---zekugepazenawalujufuka.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/732a5dbde64d647a7c50ac97af84eea4/32483159496.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/retuzovewoxokobe.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac40d7d142---zivagolepeze.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f6ca3bfb3ab54f139b93025a1570f729/zopagedelonoweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=storing+cannas+for+winterPDF 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_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 17340 bytes
SHA-256: 28d9f9dc9a440b88a2d73cd7f75fd86ec6fda0450f282c53f9368983155af8ce
font_01_sfnt_off0001250b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250B 10624 bytes
SHA-256: e004be5822ae52a62dd0d66df91a61c7d7ee1830f0ec125ec3883f7006b8931e
font_02_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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