Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4ef2e2f986fa00…

MALICIOUS

PDF

99.3 KB Created: 2021-09-09 12:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32152e52798a41d9e57d4a7f4e7dd226 SHA-1: 8aafeca26d0d2dc4c7bbec512b685d6a5da0ea2b SHA-256: 9b4ef2e2f986fa003e9947e2b00745bc74a3625daabc3ca81726382b3d662202
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dungcucaytrong.com/images/files/filirumegutelusuz.pdf In PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/61987461184.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/32201860320.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109041111572733.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-8/20210908140855826375.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/43424802268.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/57794450789.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/91035777884.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/9999743169.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/mavuja.pdfIn PDF document text
    • https://zagi.hr/files/16280628525.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/domotibaki.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/fulamipuponuvurusa.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/sitolojubab.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/xinudedupuvofafexaxinez.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/gexuwitafodoto.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/zikibe.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/12658909506.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383cd66cffc---sudafini.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b7aaf7116bff5f77472ea3697d3ee354/4184632997.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/baf20e0756d362dd56906862e2c4e53a/26656608670.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/96010641810.pdfIn PDF document text
    • http://jaatkinson.com/userimages/pukolevaterefor.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/39862556730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dak+tracking+systemPDF 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_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 10612 bytes
SHA-256: 3ec6381229033b6733b1e66c61919130d35d29598da28f62768ff9e3a3f7e948
font_01_sfnt_off000136a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A0 18964 bytes
SHA-256: 9dc4d8540bcc67102605e841f604697527739b2046c62f4a38cb8a5d826167f2
font_02_sfnt_off00016755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.