Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9b4f3e4ad84ccb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 04:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0acd8ae9f8002d113eab6ef6af2f0758 SHA-1: 9f6a9d02edb48e6e8cb2df85d29d90b4698dbaf9 SHA-256: de9b4f3e4ad84ccbd1d53e9d7d2094a6e80b2ab860e7d961d6567fe70ebea924
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads 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 a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=wwe+12+apk PDF link annotation
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/27528799084.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/tifoja.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021911109142487.pdfIn PDF document text
    • https://sambelteri.com/contents/files/61659981045.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/32373779991.pdfIn PDF document text
    • http://modern-pro.ru/files/file/xezab.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f137e1e6---56204653299.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43ad34057---pukakonuwozolol.pdfIn PDF document text
    • https://kvzriu.org/images/file/81920117986.pdfIn PDF document text
    • https://tempegaring.com/contents/files/59022607354.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/52942003649.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/natal.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/86997937b0ef08558c8dc8639632f566/78576246903.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/wixaj.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/zerefadiju.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d215e58d88---famana.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/82140052269.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/famulironugatiza.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/58509562298.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/34376164403.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/xewetatilelo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee44c8963---ludipu.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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 9860 bytes
SHA-256: 44c5b1f088c47ab8107fbf2c2f1145e011ae0e86ac26717221d1041a585cc809
font_02_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 18364 bytes
SHA-256: 7ddf534469264acb1bd2b2d6a9f7b9d00c199bb3c48391eefafcd5c77d190f79

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