Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cf5dd2488db79b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 02:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3956935c7bd1959d693e28b2099f1e5b SHA-1: eeb245713e4ea1f3ddfc7a51a2a19a5a0e4d5a19 SHA-256: 87cf5dd2488db79b7bc8de8900c6fdcfa65c19aed52c86f92c6e77b6d975e0be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6c5d4531f---rovosisefoja.pdf In PDF document text
    • http://zgic.ru/!upload/files/kalumik.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/neus1kdbktia9mv5jhrp0gm8n7/tixumajiginolit.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/80474294411.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/84621626848.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/sirebololawuzobuj.pdfIn PDF document text
    • http://clingac.es/d/files/6944305237.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/bifawokov.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/fepowexukitexewile.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/11911057572.pdfIn PDF document text
    • http://ndt-ultratech.com/files/52031269040.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/kakiparuwo.pdfIn PDF document text
    • http://proxima-design.cz/files/file/korezalezabodatogeved.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/36890990557.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/nejuxutiguta.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c591e2149---xesikepikude.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f57e14830---2472185253.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/tosoxozivu.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/wijewimofiwaruwo.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/kavisusure.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/mavabivorebexexoterojofu.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/ginara.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/46848255671.pdfIn PDF document text
    • http://www.puhito.hu/uploads/jumudazomoxeb.pdfIn PDF document text
    • https://stvorki.ru/files/file/zesobilosomosejoworazerez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+the+sound+of+music+online+solarmoviePDF 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_off0000b114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB114 10900 bytes
SHA-256: e393457679c9e6cc6c59e6c9e25b61f2c4e07d0c5c185691a9ec08c7009ae1fd
font_01_sfnt_off0000ca1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1F 15836 bytes
SHA-256: 777d3d1472c8e2bddbeb6819cdf6738c5af39af5fb06e52d1684e364256dec8c
font_02_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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