Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e003f0252c722f…

MALICIOUS

PDF

73.8 KB Created: 2021-09-29 02:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 515449b6727ab9ce27f9dcddd6272213 SHA-1: 43d4fe3a030f8cc817692ae016171d2a866ca528 SHA-256: f1e003f0252c722ff64517aed0adcdf5c4ef9c078bec03a6270d738f2d3979ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=tamil+dubbed+hollywood+movies+online PDF link annotation
    • http://dspec-car.com/js/upload/files/17175278506.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/65770214003.pdfIn PDF document text
    • https://angkalaris.com/contents/files/benotenafikudaxavefujag.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/kazekuvilifutejigo.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/91259730501.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gp7v98h7kg5i1cism3or1bpm92/vimanujibaxajepuzibetinof.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/67197112480.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/govewibakaken.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/30796592631.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/83826935352.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/lenuzunemifidip.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/21659412504.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/45996971662.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/24630743493.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149ce4246ce6---kisurodifi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d18ba497---xapemelikavirif.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c97bbeafb---88642435878.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/xulurazadaguzu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136967e56b93---6138821441.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/8109328411.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/nasepukoferufelasa.pdfIn PDF document text
    • http://chongros.com/userData/board/file/kibisawofivesubopimiwosu.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/dififuxeno.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/tizujepasuwelimoxom.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210928213440.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/95478236305.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_off0000bc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC02 10784 bytes
SHA-256: 31c4c4e97f8d0941521a30226e02a7e77137c704a7d7648a9c5be9a5fad83404
font_01_sfnt_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 17372 bytes
SHA-256: 153d5dd6a706e8d4fdeb39a4696488f5f48a1682d75a8afdd0a79763c3755946
font_02_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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