Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cddd7914932df7d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 22:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5712100bf2e9e335d0f0c5223f43c8e5 SHA-1: 5c4abe9e450cecdaf607efeaf34dc25afb62e638 SHA-256: 2cddd7914932df7d6c70baa418abae2555fa82458b42e671cbdde7caf1805b55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=short+vowels+worksheets+grade+2 PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b90a414a---59975031542.pdfIn PDF document text
    • https://limmaginebistrot.com/file/zabotatupisodorilo.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/puvupekoxarusid.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/636e34c905f0aa181d2f0c27177cf62a/dezogepowegejuwexafamow.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/12949311188.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///47013480358.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/6139643493.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100d8e3dc109---sobemofiluvurefokerixad.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/44sa9frspof2grsdtg5fsub210/30224264185.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/xixejudovejepuvu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffdd84b686---21608421300.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/7789773212.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/pezanarixikugabogojodapag.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0362d9ed---33056413053.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/rijiwovupufikurulabeni.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aba2ec9f09bfc6497f4f4779d3100a2c/50371527506.pdfIn PDF document text
    • https://turbooto.vn/upload/files/86561100315.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/joboruduxarowi.pdfIn PDF document text
    • http://vina2002.com/uploads/files/rupugiresuxekozedu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/423002293820f28bc70d402e0e9f6634/99453372149.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/4e9f18b3c420f21a6cd4dd2050a99fae/48867410663.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161261ced60818---27825365957.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tkaat7pej6ekkr17g36ht4972f/68613081559.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/jabekamed.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///bobibaz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zizuwinuxesapedapa.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/jufidoxorujogizagetel.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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 17868 bytes
SHA-256: ae89e4c165fbc9f89da9fd9e0a9657918037888f97af2c7f85fe78ed484c6cf9
font_02_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 10768 bytes
SHA-256: d3122d7cee18378e715212947ba380713bd0aa157430f3e697c3d13fee019ef2

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