Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d1e524e98c6829…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 20:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd768b70afdb4ceae031e5bce90fe78b SHA-1: 2c239aba0999a827ce60366bf93d003c43e846fe SHA-256: 92d1e524e98c682948436edb65bfdedb599957290cb9d6db78836a8eb75d94fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to lure users to external sites. The presence of JavaScript indicates potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smshealthcareservices.com/ckfinder/userfiles/files/91411062434.pdf In PDF document text
    • https://bepxuyenviet.com/upload/files/sidadajozazutupewimumud.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/814724695.pdfIn PDF document text
    • http://christopherdallo.com/file/ziwabipubitijapupexe.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/87295268120.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906063722299419.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/1558495748.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/82856387074.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df22677290---8743455919.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/14076998395.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ed47b79c---13240665893.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac695b093---josazupokazanuzatitedej.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4d5a7f07---41326030967.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/47785480156.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/beboxafer.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/jilisuguvekiruvoguza.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/53911273842.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/fipukikepujotobo.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/tozafuk.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/21035352520.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/21037412365.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/94709310966.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/84559904404.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/29267655103.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/sorixidoguburepapiwijifis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+app+new+version+downloadPDF 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_off0000ba91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA91 15836 bytes
SHA-256: 29f25bae80cec530b8b9ff31e8c7948e91dd9d83a0f8c9c01f3ac39ecdc819cf
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10672 bytes
SHA-256: 3334c3ea8d921a9c51ec1aba29c262099c8e39f895c058ca6d24c535e8253ca2

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