Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff59f5c0dffd8918…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 18:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d46e9801b632de9f1c2bcb20232a012 SHA-1: 2f38c72c5f73fcb2e1449c8bd50775e0de3c4dfd SHA-256: ff59f5c0dffd8918429c5095c0f89c8c2e14c019d6ca763f47078a7f70eacb82
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the presence of JavaScript and external links points to a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=beyblade+burst+qr+codes+rare PDF link annotation
    • http://baodieptailor.com/uploads/2021-09-10/images/files/62679523070.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630575935.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/godupogimesitubemusar.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed595f1b2e---19062758712.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0a8d80116bfa5c49d3dd92cfe6b6f17b/rugoneputifuwa.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907153314563042.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/32222185483.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/luwutesokisijivizemegojaj.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/1141997582.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/11371753990.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/51fd4d7f2c54a36bdd2a012dc785a907/14344240108.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/derapumes.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210911051139_682329620.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/gorozowikarabijofe.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/mufitezutilogupasikil.pdfIn PDF document text
    • http://uhorder.com/upload/files/21420967558.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/74177287344.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/ligasa.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/50545101404.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/lifidowirutebeta.pdfIn PDF document text
    • https://fptica.ru/images/file/48997860520.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_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 10720 bytes
SHA-256: e56754fd33e4abc6aa19e1b53a0ded8c7aa0a2e77c98a52ea304017a82f7bb32
font_02_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 18376 bytes
SHA-256: daa577a87ebb2090e2d6bcce7045cd32969c7e0d4696bc88bb22315cc0bdc02a

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