Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7c81c2d13bea35…

MALICIOUS

PDF

93.1 KB Created: 2021-09-16 03:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d40847496913067d6a8a7bb4da3928ca SHA-1: 37ed9cf317e68d43ab4b3830f9379907da360019 SHA-256: 0a7c81c2d13bea3508c8cfeaea70d1eb0081e875a3623ee74d7de2ee0a984b38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://studiomuraca.eu/userfiles/files/72664876453.pdf In PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/fizegegadivuboni.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/sogon.pdfIn PDF document text
    • http://muszempilla.com/files/file/57138893548.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/luvagulatomuv.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/af30a7d1fd34ba0b0c3f30d1ee107856/84306231343.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/43427460547.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c76daff2---zuwuw.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/xufaxabemuwemeb.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/zubopifikopajoremigaviro.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109020430403835.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/wuwada.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/ludobozi.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/9599769285.pdfIn PDF document text
    • https://avflash.nl/upload/files/23617058579.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d695f545cc---88005677004.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/43025463461.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/45661276199.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/pagiwimerabin.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/kamuwupitefedipu.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/lafuzivewu.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/88544646055.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/godonowaruk.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/pesofepekineve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=poprey+instagram+likesPDF 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_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 18764 bytes
SHA-256: ff280359ecf16b10d304f47bfe48e70f769ba49fb61f55b5b6665531ef5bc98b
font_01_sfnt_off000135a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A5 10800 bytes
SHA-256: 2a98fc4797e9c7606c9abcd4cc77b50b97fca47e32051334e7283f63ce8a0131
font_02_sfnt_off00014e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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