Malicious PDF — malware analysis report

Static analysis result for SHA-256 5450040436c89cb0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 23:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23721ee9e8504640eede16cb759880d7 SHA-1: 556fef63192f39210d86fcc9f72ef8434f779043 SHA-256: 5450040436c89cb037e2712500d9e3b45886f73cfb70f680cc664bb28c334693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://prtourusa.com/FileData/ckfinder/files/20210918_BD66C311D4713E28.pdf In PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/towenebagexore.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/mubufabegatopujo.pdfIn PDF document text
    • https://tomas-music.com/contents/files/90425454934.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/ketutoxabajune.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/kagalun.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/19838553554.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/64374386551.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/63559433348.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/60803591646.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3b6d606a---47355841047.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/93979270301.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141887cb1f1b---wixidonuwujava.pdfIn PDF document text
    • http://lblussana.it/images/file/24227143704.pdfIn PDF document text
    • http://jsdarvin.com/files/91648766979.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/35631103317.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/30800308180.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee224027a1---76377828267.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/26d0e7d4a126601a324147f526e9689e/batebaf.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/vafekuzaned.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/43022908555.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/55865111367.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/560faca3bb36df1702706dcdaf897ed9/85955329943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=registry+cleaner+for+androidPDF link annotation
    • 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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 18644 bytes
SHA-256: 92990bf6342f9e5c4f2182d695daacbd6bde01edc1534ed8c690692f02e084c5
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 10808 bytes
SHA-256: 9c79338d17e1cc6635bfe92d3f0f66eed8d407e3e6373a32e33ab7870cbc34fe