Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce912fe81e2e313…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 13:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e2d4ffc8e0a358f0b6ea0b264ee1f3c SHA-1: 9f4c31d7c8ef09f117dee7e12f0869a0e3a31e88 SHA-256: 9ce912fe81e2e313c3cda4ac9a29def71873bb9eb2413d7d230025684ba4df52
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's a social engineering attack, specifically a 'ClickFix' lure and a 'Browser Install Lure', instructing the user to run commands or install software. This suggests an attempt to deceive the user into executing malicious code or installing a payload, likely for credential theft or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jills.reviewz.eu/app/webroot/files/userfiles/files/juwogodidobipavujiviz.pdf In PDF document text
    • http://askort.pl/Upload/file/47400661793.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/72161787113.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/ladonezudilemufijedebuda.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/revuwa.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/1334151326.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/32295030329.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/febadusosenaliledozu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5de44205068bf86577166fda66b0fc73/jefinefesupufuge.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/95410217289.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336a3086b26---30141741528.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/todogajozurekukul.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/dc6c64e3e29b63a56f5ae699f9da01f0/rubojuwozotepusu.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/24796521980.pdfIn PDF document text
    • https://onlinendttraining.com/files/laguzedefigizudabidajefex.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/78660988803.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/vagageluzagowaxer.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xepotani.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/zeparixisojan.pdfIn PDF document text
    • http://teifsepahan.com/files/file/82626023289.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/lizubukituwodijinawugabo.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/13885289500.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/10284571417.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8c458e16---gekikepufijivibiluzoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+uninstall+chrome+in+phonePDF 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_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 10816 bytes
SHA-256: 3f2e078d828163aa43aa202ca9d7407bddfd77247610a1e36e3d92f166fff0d2
font_01_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 17976 bytes
SHA-256: 128d6bc9b8ba3cc17a400b326f8d8d4cdf836c241abada6c5adb323551e11748

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