Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef54ad4c54a386c6…

MALICIOUS

PDF

74.2 KB Created: 2021-09-25 19:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9211058ba693bb4d97f10750579da00b SHA-1: 7b5c5ab1fb61706a3a75ab30fc96de3800dc95ec SHA-256: ef54ad4c54a386c60a5b08b4892f4e6cfecce05f2585cb320e9c66fc0dacf401
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=android+8+death PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8r56hptnimdh7tbj7ug8qe31rr/22415029450.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb0921dd0---naravagusenexegefuwopojus.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614441c1ced05---dipubexejo.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/tapubomukixevutovewunumor.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/12634129436.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25790910005.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/40708278427.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/trm187jpgpqq6tn4r67uam451f/33972019497.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/vajetadatodi.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/46312419527.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/74878804921.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/36312794340.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/mekud.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/27148422974.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336452760f3---denoke.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/89315892982.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/57510592544.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/96737548692.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/sixopixed.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vunuvapetesuguwudorigeki.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/19446389675.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_off0000bb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6D 18832 bytes
SHA-256: c76c4d3b8d415dab0a50450b86457381706571b8ddde948d27c635bd0e80ef56
font_01_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 10320 bytes
SHA-256: 81bce18b8049e33e9743ef590a287178aca0fc11a9c60d8be5a427fd5225fbb9
font_02_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1