Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdc4727dd21d5b9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 15:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c41e46096964aae67bbeadcaab5140f SHA-1: 501415cbe202258826c6334169e0057e68e3182a SHA-256: ecdc4727dd21d5b95a8482bf32e3b253e16c9fb2efdddc3222a2bef75bb7a686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host links or potentially execute embedded scripts, though no scripts were explicitly extracted. The presence of numerous unknown URLs associated with compromised CMS uploads strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80aadd5ca7---74597008582.pdf In PDF document text
    • http://khocabien.com/uploads/files/18169713845.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16088f9df5301a---87100813403.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/56725612296.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/13329433913.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/86834098326.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/jefuja.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/cpmqn0lqdmp2an7rlapjil5j5n/tokajaburosiperojejuven.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6a3e9d009b8a06510376fcab5cbb6080/zizizuxalomebivusu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16116c2d432ef3---37451296036.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcfcd24b8---34488374936.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096597fd3e5a---bojukoseguxikivujimuwenam.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/67f4c76cc290f8628e8128c65438ddaa/58139304807.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16076a00a3531e---lazozuwikaxane.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/marilesogetesuxojoza.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/wugudutaxupurazul.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/956f8832498033244eec6cfd47196143/zaxomebidar.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ssb6oio6nhca90otnckr1r4nvi/65302439046.pdfIn PDF document text
    • https://luminex.pl/upload/file/70725319539.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/karazuzaxal.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/69580446243.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2845ae3cc537127e8fc956d5d913815a/lawapepuliwateret.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/nizexotubo.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/lutus.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/tijujikelusip.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f309e944c2---67744039428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+reckoning+david+halberstam+pdfPDF 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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 17524 bytes
SHA-256: 3d95a8c4f9f7916b0e7cd3c093276933556ca35fcace350fc82f68f50a68c08c
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 11328 bytes
SHA-256: 86d68cd6aa724a76d7da750ceae2096507394e15a03da8f3d0f189012ba007d9

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