Malicious PDF — malware analysis report

Static analysis result for SHA-256 9821c80896f2b585…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 10:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a45374b1c60eb5f580e05606dd198a4 SHA-1: c29d5a34e74688d2a54f0b6be13570582f6a8562 SHA-256: 9821c80896f2b5858056183acb7a068c7cf238541de0417e0517cead8e9e2b22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely serves to redirect users or download further malicious content, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=photo+slideshow+with+music+mod+apk PDF link annotation
    • https://bimore.vn/webroot/img/files/61525581950.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/34289700796.pdfIn PDF document text
    • http://knipia.com/userfiles/file/ririkiw.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/govef.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/16358563014.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/xasojowabav.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/60884289413.pdfIn PDF document text
    • http://infosierra.es/images/editor/1251884345.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/82192337338.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/90807000004.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/59520587596.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/faviv.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6ec5c514---gazapifax.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/63107410374.pdfIn PDF document text
    • http://dhf-china.com/d/files/lijutokojusujekonovegokuk.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vowomi.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/45343101690.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/45233480321.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442c3f372e4---sixabuveru.pdfIn PDF document text
    • http://progetec.org/userfiles/files/32256787844.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143a364273ca---gojavazivejanowakusosata.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/55000123544.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/h7k605pja63j81j82cl1o4vt10/barive.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36b1bd5ed---12190298196.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/lolagepixepizefumef.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/28506953184.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_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 10856 bytes
SHA-256: f5a052935782aa5b831004445a888e319b5c31396586d3e8196d83211dd6bd78
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 19696 bytes
SHA-256: 9071b6d76518e9f7a1abe749cc4836248de2e297a241b67a91ac314da0814028
font_02_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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