Malicious PDF — malware analysis report

Static analysis result for SHA-256 129c7e2d044fb664…

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 21:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bbb4d9fa8e553b5ab4548408e6465c31 SHA-1: 0d0be94d52a23a9c466c1d01d263cbd8e91d9154 SHA-256: 129c7e2d044fb664ecf04977ec41ebccd09db1884774ae109b62c4045b3a4d93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://laborke.ru/uplcv?utm_term=braven+stryde+360+manual PDF link annotation
    • http://www.tiande-global.com/ckfinder/userfiles/files/94380055214.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/68837829692.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8e950fcb8d6591a6e949166265136da7/79457958422.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/fakigisiboperafeg.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/wobigidomipezoruzubu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098417fb2a9e---merupiviluruwomupagepoj.pdfIn PDF document text
    • http://www.toptehnik.si/images/widamirijogar.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/93179449289.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/14m7h871ofdthgl4tppl68fv30/romukeludikotunixibusop.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/81394631814.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/63vik57s07joht3j7onhfm6ago/61350121414.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/dedisonifejam.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4146012d62445c2d093048ad3e7ad6ab/13821015326.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/puzuwetogexikiwobatetap.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/98568598344.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b71d33c6---dipasunetaropu.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/34658049222.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/19238292009.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc46bc9de8---kaziri.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d26893bf681---zonek.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2e1tpoqrkdb9fmif75gmfera68/23594978542.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b4f4bd46bc62a29606973b633ba7ba3b/94088938904.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f64e2d18---30825422566.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4142fea2ff247b178d2d23dfe73fc091/65279566714.pdfIn PDF document text
    • http://rld-carbon.ru/file/81456928404.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a63b5e92a---18169461146.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_off0000ba99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA99 10992 bytes
SHA-256: 08e4fb67b7753b9c18b82d7f355ae501b7b6c7e5b659762a98b7b2f597825a78
font_01_sfnt_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 16180 bytes
SHA-256: 27770292b0b98006ac490e810c57b9f2c616fa094283cb175323ecdba6341de0
font_02_sfnt_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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