Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3f93e0e2a09b68…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 19:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86af594a30a91db2e1b62953c10a7ed9 SHA-1: 611aada6f07a5fe1da59614d6e0d15abdf8e426e SHA-256: ce3f93e0e2a09b6804185b957b4f0eac711ff6d59c60ee5bf42ebea6fd208493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URL analysis reveal a link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://073741256.com/uploads/files/202109102117359399.pdf In PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/6770272266.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/14402185544.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9b5a70e4cb3eafa709884993e17a6a7d/508976408.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/43776549356.pdfIn PDF document text
    • http://teraval.cz/res/file/89944490144.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zuzaxikexo.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/36226690731.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/kunikuxopune.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614776b5a1cca---lufawikukejabor.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/puwesavixezafituliw.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/86773285289.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/gumoso.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/37848648186.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210915_57AA05519531D58A.pdfIn PDF document text
    • https://fuoriscena.eu/file/86232613998.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/55893028284.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/gemiseli.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/55217367547.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/pepatafajul.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c84f0b5f95fff27b62e26e2402cf8015/89123677881.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/83421497284.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/ninupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rick+and+morty+d%26d+pdfPDF 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_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 18556 bytes
SHA-256: e056864eefa1de1096343a35cf61135e72b3cc3ef51d85c5a058ce7930527b05
font_01_sfnt_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E68 10436 bytes
SHA-256: 3889bcc9c359e91dd8116a0cb21440973d4108e759915c3e61dea957b5872342