Malicious PDF — malware analysis report

Static analysis result for SHA-256 474e6a61cb2a993b…

MALICIOUS

PDF

74.8 KB Created: 2021-11-12 02:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c106cf0f555ab7fa91eaa5416305588c SHA-1: 6892b33d10fa98351cc0e39501a1c04b30b6ed7f SHA-256: 474e6a61cb2a993b19a98eaf404fa17e261e6c5ae0c88c0d6c3ea8c3a84b4189
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=d2+truth+quest PDF link annotation
    • https://ikuseikyokai.jp/ckmedia/files/fubujok.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/23792765343.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/22464983240.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6m8377ckfqtmigqsabkfeormf3/32398948156.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/47016f5aa636dca98d0a6fe458612198/89440645728.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/58402738428.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/debosowog.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/94787721084.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161879347a1b91---14948358826.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615f2f8cec70d---wanef.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3dc24a049b3f1cefd20cdd160d3df5a4/gokasumelozifepuwitil.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/xajujadusuvosan.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1633665259.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/43572446994.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/kibopipafujabetebi.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/77499699801.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/sidusemetum.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/relenexapawuluvesaseziki.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/52454778255.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/nizagolenigerowowuketuf.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/95585783321.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_off0000c504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC504 16676 bytes
SHA-256: 9b5bb6d020d9e3db56fb6e76317f9e2419a4aa17e18e1adb99a0d173e061afac
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 10048 bytes
SHA-256: a5758447705b1248feae0f54b412819d710ba77578591d168da418a83bcc51a6
font_02_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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