Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63453fba98970ac…

MALICIOUS

PDF

81.5 KB Created: 2021-08-17 21:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4defc759eb641a4cad933db38e69e75c SHA-1: a18bfc31d6439dcd967ee9f6730e59cd3ae9e2d5 SHA-256: f63453fba98970aca22c7a4118520c74ee312fad865569c90d6cca02d06ef6ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, designed to redirect users to download files. The primary lure appears to be related to 'roblox studio download', suggesting a social engineering tactic to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=roblox+studio+download PDF link annotation
    • http://silesiacapital.eu/data/file/12159481154.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b589a67a25---waberokakekozit.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116b18580044---babakatusatozurumebetiwij.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0983cab58ebfe6f3ac890623cd16dea1/burimuwawekeg.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/subon.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a25b594e---gejomunikekuwozuvunuvis.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/mukov.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/90075497889.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/jivadil.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210710110158.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/sudefadaterigu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096309349705---davusajeferibefon.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/71c0bdba12e9414fd34d2dd092b202c7/dufopetezububed.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5610c68d970dd15e57440c7a4c2e0d4c/zinagexizipoxolubebafaz.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d889d986da4---tijinobunafifujep.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e61351fcf---finagegaw.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/65797727bfe5f4e291d4d8420961fda5/towelok.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c9152a2d2---vikezonelevewal.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/mitofimatafufezugosonim.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/b0q3uc9sfg0gsnl33nbbgrla85/20160109710.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/52235456921.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/acaoa3820vi0si64m5gke9g8s4/jodexaxokogemijojuxur.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/51152126731.pdfIn PDF document text
    • 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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 10480 bytes
SHA-256: b21cf6ec3549aefae4ae1615528ab571699b2aede4d8a047c8856c69972462d0
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 15792 bytes
SHA-256: 4cd8d37c561128c5c62fa04b8b19dce39611174eebfb505ff94e5d0aca242859
font_02_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1