Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8981286dec6c1b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 20:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a955258fff478f0bc9184023e51da856 SHA-1: a9610d67ece70ae83fdb3dd7c821d8629836f40e SHA-256: 9f8981286dec6c1b584f305501af2478fd5473a31905eac36ecec7d503d98b5f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics, along with the 'ML_NYX_PDF_MALICIOUS' flag and ClamAV detection, strongly indicates malicious intent. The 'SE_LOLBIN_RUN_COMMAND' heuristic firing with specific URLs suggests an attempt to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://medvor.ru/uplcv?utm_term=thai+ridgeback+for+sale+australia PDF link annotation
    • http://ziva-muzika.cz/files/file/17902966714.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/90992274636.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/93496842791.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/1959072399.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613098c51827b---61550251401.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/17726428963.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/boxav.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/fekalobuda.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/lusum.pdfIn PDF document text
    • https://ka-base.no/images_content/file/gonapegogetujamelitutul.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/55283787602.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49588633859.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210918_9B930862AC88B2C9.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u0ivrilr9qenuo0juhtn05rcs2/nalume.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/navibed.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/sudigax.pdfIn PDF document text
    • http://levotst.com/uploads/files/fenobarujuxer.pdfIn PDF document text
    • https://migger.dk/userimages/file/48059859496.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/10564868850.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/sesebena.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/itui7msknmbn7jd7a6d8534910/37832793171.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210910_8770BF1A6E7ACDC7.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jewite.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/pavokesixotusofabizajabi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ea032c1ad75aa9a8513747aaddc98b90/vilapomepirowi.pdfIn PDF document text
    • http://etasystem.net/userfilIn macro / runtime command snippet
    • 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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 17204 bytes
SHA-256: 3368b78b11891d5f930e379ecb2e261f55b666bd4c3fb6485dd2539ea11a914b
font_02_sfnt_off000126d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D5 10944 bytes
SHA-256: ecbd88fb9a30783e43649049c1d07fadb8ab7bf0dc64796062825d469d856ded

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