Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9846c4615ad782…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 00:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 854a8a5338bcc3148dbe93e763bdf9d3 SHA-1: 82de430d3c79b6d042ff8be2126492868259af87 SHA-256: ea9846c4615ad7829326fa6505253657726765f940d12df449d443bc747def54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or further malicious activity, while the link farm aims to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jagominum.com/contents/files/25647187683.pdf In PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/60550661094.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/6739518326.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/56484196405.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/fonemasovutobewipoborud.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/mitakelonepogas.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ad61b8fd---jolavidasepoj.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/wolofekowowavametezegigi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8ea7f5a5391d8fce78818e437e46274d/bososodojefifo.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/gufosokirigowebuwepuwidex.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210912222331.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136f72b399e0---96478801616.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///17111256167.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/54236164447.pdfIn PDF document text
    • http://enricobarraco.com/files/42017075038.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/59364835399.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/jisex.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/28632139415.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/50169822864.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/34742584910.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630763762.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109010622044891.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/25854690966.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/29932647031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vip+mod+pro+v3+apk+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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 10540 bytes
SHA-256: 40a5695923f516866d57f640edced00ec3a47841e0fe78223687a57889dc6248
font_02_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 18588 bytes
SHA-256: 70b49c96714cf40d4fc75b71d933e85114e5c81275f024fbe76fdc1ad9a65801

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