Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a4f67f842d580e…

MALICIOUS

PDF

85.4 KB Created: 2021-08-25 20:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9df2b8184ba1365f68d8a96b0713c8c9 SHA-1: 9bedca863d18396b91c58243ce6cf11daf26a5a9 SHA-256: 15a4f67f842d580e104ff0689cbb42e1e4fd6c7958fbfcb7c2498e25290c5cc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing attempt. The presence of external URIs and the nature of the heuristics indicate that the document is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://garglob.ru/uplcv?utm_term=pokemon+what+level+does+riolu+evolve PDF link annotation
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d12ac20a5a689e3c3709c36994426be9/mifuxunoweveneke.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/xoromusetebe.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a848169c---51876856439.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/p4u837aqqlbl8nc74oodhhh7ts/musevoruvevadofaxubev.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/88a8da39230d2818c7cefc81a0f8f850/tonorev.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/rebuwelajuvovu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf580aabfa---banojanisadin.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/87287536623.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/08dfcd02af8466e6d53e099f4799d013/76046071330.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a903ab45e3b---57356740690.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2682b4f8c6---46147236834.pdfIn PDF document text
    • http://elanaclub.ru/userfiles/file/tozuvovaluxumorewusebo.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/94417921026.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/19368908875.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/tapawixosusawugaf.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b347c376f---29318417942.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c481c6ece89---bebuwuxavaba.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/12175571090.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1bda8d7ab---85418636194.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210605104910.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/viwiditisamujoli.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 2992 bytes
SHA-256: 2ef9540c1b6bb4f9de6d1ad6fcbb745c3708adb2794f0c98d5a243f7c85fcbfa
font_01_sfnt_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 10856 bytes
SHA-256: 6d9fcd637fe8c7ed56a569fbd5a85791056eb85b28c18d845d8756113a2d6931
font_02_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 18476 bytes
SHA-256: cfdf910452943916ecd434839e1819fdc31e1bf34c62d6210e7726ea47c6f762

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