Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5137307dcac365…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 05:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcea32c85055ca4818dfc922db2c63a3 SHA-1: 0024c978648c38e95b3144f50f8dabc02c4de311 SHA-256: ee5137307dcac36534774a2bc2992e44697441bd87df5c54e4a4cf34daa32eb5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d258e649---5862261870.pdf In PDF document text
    • https://tomorrowhubs.com/upload/users/files/5539107137.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/958b8d358c9833b6e22f3e518f0a760c/87363757059.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3c890675---29086073468.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/32843903452.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/denonanegefiw.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/69475383154.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/48790351453.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/tujozepuvisotubejafobumi.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/49f978d65a4e212cc70438934a5cddab/suditalekipamuneta.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/53509525279.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/rerefu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084006944e1c---wekadopobufanofirelugi.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/7556200361.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/k4q5avrp9fc54dtu8pc10tsa9c/vononuvupesozeza.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/71730253498.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d75c45438---48215017619.pdfIn PDF document text
    • http://orenprom.com/img/account/file/jetusikinesubajekaxaxax.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/8vtklo8qakcvjeebe6296ie9ne/47967165207.pdfIn PDF document text
    • https://subarini.ro/mm/file/perufokalab.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/34900908987.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/wolekugojawilutel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=have+to+and+has+toPDF 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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 18256 bytes
SHA-256: 3fd842e826acf114ffc80cad1ac159061f4020ffec69c528b7f8bc6d65f6910c
font_01_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12894 10164 bytes
SHA-256: dda4bb13ea3a12f26d9e90c536262e13ea653d4f59e88bd879be24addfbc1546

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