Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee05a4589530c3a6…

MALICIOUS

PDF

68.1 KB Created: 2021-09-12 19:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2e58f8d3b635c804ce7d342d7568e77 SHA-1: 156e533f124ea723c322b72f87cc1f76eeeb4a1c SHA-256: ee05a4589530c3a6617abf3f91eefcb95b1df3c8a515039120bf65fc36f5d477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, presenting numerous URLs that lead to external sites, some hosted on compromised WordPress installations. While no scripts were directly extracted, the presence of embedded URIs and the nature of the link farm suggest an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://noospc.ru/SITE/files/editor/file/nigil.pdf In PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/kemabefojunofeka.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/49621984366.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/timofatuloravel.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/46704916913.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/luxipu.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/55382551769.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/49644536199.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/solumobukenikasifipubad.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/adb483469c55241be1a9f26d533fdd59/wililono.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/85272059317.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0beddf0fd044aa0fa74329267032c656/vegakofuzutaw.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210908011923.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/wukinowilabu.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tusagowevisavojefudezis.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/dibobojatasofo.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/lodavikikewojinifozij.pdfIn PDF document text
    • https://ags-car.com/upload/files/72556439462.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/gamatizewekeroto.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/livapadojorexisavetefa.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/830d41714ea72b715fd2902c985d08e2/jusebeju.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/72720787738.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/49112715530.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/vamofurusomevime.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/watuporiniva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=d%26d+turn+trackerPDF 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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 14288 bytes
SHA-256: 9374dfc54b807fd4569eb98e781cbba06b47d9ed6c668832fe8e9dab1e43b656
font_02_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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