Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4035e6919cdff88…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 01:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 742834c1935e7493476adffe306a1b89 SHA-1: f964d032fe6ed30edb604c50c6368cf6c7f1e595 SHA-256: f4035e6919cdff8806417f39aa53572b414b9cc577b4c2823ab325ba4d613afc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external links, many pointing to disposable hosting or compromised WordPress sites, indicating a phishing or malware distribution attempt. The embedded JavaScript likely serves to redirect the user or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=board+king+apk PDF link annotation
    • http://lustigersteirer.at/userfiles/file/digufapotimatasuwapolo.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/40588837362.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/zobaxomolif.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/32234701456.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/jezemorogulade.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-23/20210923002937675953.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/fezuj.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/75447457844.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/vebev.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fakuxejunu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4692937611daa7939bfde36ca24c6323/wakupomepipatomok.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/taxijuladafigabasigap.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/50824467050.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f1852a99be96e75a37444358194af33c/rinawalideto.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/87396263049.pdfIn PDF document text
    • https://fuoriscena.eu/file/lojatunemegabudekibu.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/84408652300.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/93208740679.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/jiwun.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d4421daad243924ac40cf6f2abca902b/29781831996.pdfIn PDF document text
    • https://makenie.com/upload/files/87971359823.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/2834205101.pdfIn PDF document text
    • https://basisangka.com/contents/files/zetezasikagimoxojidelo.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/powulexuwuni.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/towopemo.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_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 10268 bytes
SHA-256: ecfdf255d55f65567c4ac98db2c946e0e5ace3a338e92316cdf5d936cd10d6ff
font_01_sfnt_off0000ca15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 14676 bytes
SHA-256: 4c8933dc0bef99c06b6f7bdeea7d38de5cb76bb2a6af4e064024616a56b72316
font_02_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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