Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75d475bf12dffe8…

MALICIOUS

PDF

86.6 KB Created: 2021-09-24 03:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8e3d9915cbcd40dc75a4449b5fa39cb SHA-1: 68c0a3085c95d5cf27608ed65944fe6aeb7acb75 SHA-256: e75d475bf12dffe8ed0aa0899c3cf771d69c8b968f75a848ae005cdc900c0a47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=top+android+apps+for+movies PDF link annotation
    • https://mangonebike.com/uploads/file/93236216172.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/gasumubujisodedimon.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/gugugukijanarozuburubu.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/janatejeputezudowujaxa.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/ruvaxuwe.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/betowumufemirojezob.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/bosolejulesazajudun.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/40014351401.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/6fa85fe304681b1901970597eef9dced/rexewigelagidow.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/tojemebuloroj.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/bolitafesutovokoxusiva.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/kesav.pdfIn PDF document text
    • http://idevoz.rs/files/xefulodikan.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/wemejevomopalavimokewavu.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/zitatepefuxe.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/dalux.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/xidab.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/judizafujovam.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/9251800631.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/1782310422.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614380e622652---fuxiladonawamopanuse.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/wibinomiv.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/26871634126.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/24057973583.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c6b89c16---mosezuwijonexebitivuzilu.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_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 10544 bytes
SHA-256: a3412a3d42d8b2003a8d926c55fa523c85f53e054e94587ef45b634d48076bd3
font_02_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 17020 bytes
SHA-256: 79c9cf560c528df513c12961ea5dbde0e49378af8a0c4fc8308299cedae1128d

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