Malicious PDF — malware analysis report

Static analysis result for SHA-256 55148864ca17d90b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-12 13:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fadc4e7e44f562b047e2d76de7463f2 SHA-1: 91ecde0b17df1adbd44f5b2392a9e28f07923cba SHA-256: 55148864ca17d90b8fd77756c56d9d33a94fa960fcd43a270ef38faedfc6659a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=radhe+full+movie+free+watch+online PDF link annotation
    • http://esistore.com/userfiles/file/20316521319.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/satefex.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/bunazoguruzijarafuxow.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/perufamekosaged.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/sifujerodemifikunozuzes.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7c0f09ff---29271106132.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/lumawaxodiwaxogumiwilula.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/latujejaw.pdfIn PDF document text
    • http://jar-ted.pl/file/zipurexatosoduwa.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/54753522186.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/182545031.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/naxusinefowaju.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/72092780407.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1ed37200c47cf887b4ee64f4d82cdfda/dawinamogemivarut.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/vavenore.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133967e06d6b---rajibadoxorimixoleb.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/22572456784.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/11170279426.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/91513048b6495bd4891abcd29dfdf9de/togixafazidag.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/batuxewisimadi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/13875899064.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/4830914293.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/fulozofikota.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_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 10868 bytes
SHA-256: 90f2aa211c877e1bd6f84bc893bbf8ed18821d0cab556104cab0b6378e393d7d
font_01_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 17868 bytes
SHA-256: c3a3d8f496a2b721b9d5ff4964588ac7ea235c00d61d1bbcdf11f0ce18b5f890
font_02_sfnt_off00013c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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