Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6753fd6698f327…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 16:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d02e1a06996f2170354bd82c056a0b0c SHA-1: 6c7945b27c4b0e115cbb18fca9d1823d5278ffa4 SHA-256: ff6753fd6698f327ba827a74f55a4a11cd4dba1709b90e67d3c2f179117cb804
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate the presence of a link farm pointing to various PDF files, some hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://przedszkolenisko.pl/userfiles/file/goliwivipiw.pdf In PDF document text
    • https://cuichi177.com/uploads/files/202109121151172900.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/39094848933.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/97213131381.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/sonotopadiwajugajuwuzodux.pdfIn PDF document text
    • https://bandloc.com/FCKeditor/file/darenewuvibilu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9ff41khv0sraa074k05am806sa/65724525708.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/73617016793.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/godekigowoduk.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1f0bd9b1---panaj.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/dofumumuxiligexutejo.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/sitareto.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fidkg3ss6c5dn6khk7tkna7r5b/49696946071.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/90380619121.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/bebuwuvurokazuwo.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/rikije.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/28081604349.pdfIn PDF document text
    • http://jar-ted.pl/file/ximivafeg.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/23011752228.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/sixokojikarikoxowikezi.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/wivavaf.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/ziwusafiseg.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/23320568604.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/70547741005.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/jevoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=resso+app+download+for+pcPDF 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_off0000b0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 10552 bytes
SHA-256: 93bb25279992a1cc3c36df64f85810d0eca666d1ccca07aef61dd5b161f99b2c
font_02_sfnt_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 15792 bytes
SHA-256: eb57a3bf4eed0f2304514245791ba83e0dcab78f6650e3845994ba61cef65996

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