Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5be767c9af04bb…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 09:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19e062bd196e4d1a21f94f4f02309163 SHA-1: 1b3be83ac5a78c9ee8b851d1756ce61fdad6e963 SHA-256: 0b5be767c9af04bb6723b359377ac286dfbbe351eab6a98867a4c93faa5783db
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some of which host further PDF files, suggesting a multi-stage download or phishing campaign. The presence of a 'download button' lure further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=zoo+tycoon+mod+apk PDF link annotation
    • http://ttccid.com/userfiles/files/27609000415.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613445bc89bc8---nubukivujegerikidu.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/95888655616.pdfIn PDF document text
    • http://m2m2design.com/userfiles/zujexawugufuvizotunoxozi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2017dca3---25944922775.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/68139935982.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nupekafagadi.pdfIn PDF document text
    • http://poiskvod.ru/images/file/vewomufas.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/iom04ci0mvrscdejl7osr1spe6/65366385145.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/87263537982.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420ee822e8f---loxovewuvubodufupogile.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/zegabivuretagamuxafimas.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/jokitugijajisoxudagix.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/70404433502.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/jotizugifozon.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/wapotagolakufolulakisuva.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/panobedesaku.pdfIn PDF document text
    • http://8njl.com/userfiles/files/20803380546.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a664d71decbb1dcad75f0472b320a83c/dufum.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4d203a8199b84bdff907f373d47ae5fa/nitaro.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/mamigiliva.pdfIn PDF document text
    • https://umartravel.com/files/16741426669.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/99465836612.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/semuxipozanalogu.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54400739094.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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10304 bytes
SHA-256: e4b09675da22403881c4ec38cb6524216ff595cb26193922155e72eb81869182
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 18752 bytes
SHA-256: 10fd0f5065803c4343a64ea8d427699a979ff5175c48b2617820cec1c8fb915e

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