Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c4fa5c874aaa97…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 06:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6b56452ed1cb368076184595f578b28 SHA-1: aac75e38d7a6b14c418f8cd2e201e6ea774b94c8 SHA-256: a5c4fa5c874aaa97bec2c4370786d3b2551263563a11b8568240d1a6dba508fc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://holdemigny.fr/ckfinder/userfiles/files/sapogibavuje.pdf In PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/10951028518.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/61298596654.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead05a80fa---wunafuwozutulot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e00c8eddef---werilefunomovu.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/wajunepepesorisotapanibu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/87929570931.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/189fd10d4bb34f960551aa578685ecfa/95588601261.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/100734305.pdfIn PDF document text
    • https://brs.jo/userfiles/files/70893870590.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a923ea6c070d5de3f1a6a98e53242fb0/werodezozi.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/28301528324.pdfIn PDF document text
    • http://unityproductions.com/upload/files/buxokuje.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/96808412969.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/8894301599.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/18368313999.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/98396856733.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/35316804154.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/zavawofukuzafase.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/rolabinu.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/piwaliwuvoruj.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/11339927569.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb5c6409---tiduxenudodipoje.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/1230510565.pdfIn PDF document text
    • http://kant21.com/userData/board/file/41178574184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rigveda+pratisakhya+pdfPDF 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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10824 bytes
SHA-256: 4488c5d7e76905e1c94a0ca61e9ee4648cf5758d3ba39d3b46028ebf2cb47e82
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 20520 bytes
SHA-256: ea07c96070eeaafefb59a5ad578d59e6c143a9ce6829ecaa8901fb0d279d9bba
font_02_sfnt_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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