Malicious PDF — malware analysis report

Static analysis result for SHA-256 819d42fdaa703d89…

MALICIOUS

PDF

75.8 KB Created: 2021-09-11 17:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8ae1997cd169fd573ae855cd60ccf1a SHA-1: 7587d4e78a7fd16015071f3a1605beb71954dd8e SHA-256: 819d42fdaa703d890f3ab559dea40fee688731430db37e999e008daa5aa07261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, with several heuristics flagging it as a link farm hosted on potentially compromised or disposable domains. The primary attack pattern appears to be directing users to these external sites, which could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://idea-web.ro/app/webroot/files/userfiles/files/22312627989.pdf In PDF document text
    • http://njxinbell.com/upload/files/dexujetudojefexisiguxabe.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/vavalexileditoso.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/94757059744.pdfIn PDF document text
    • https://aashianarealty.com/file/52793200312.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/24795693369.pdfIn PDF document text
    • http://asfalon.com/__files/file/favuwu.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/fikadug.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/97263057054.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kotepulinaxujupoboje.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/wodavatubap.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/sajaxubovelemagajiruli.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa4ca5f36---21237822799.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/29815331956.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/20142900284.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109070136344387.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/lakirevewaxobifad.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/32f7e00f9685a72d1034a5d59a097a4e/53264563793.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349f983d82f---53400876595.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/67657291570.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/witakatotevivijonogodax.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/58618752779.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/52165242975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=atv+launcher+pro+apk+free+downloadPDF 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_off0000c012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 10780 bytes
SHA-256: d72d533d57de09a8f195daf51e68e9db2729949bd6d72d409901cff739f0d7a8
font_02_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 18428 bytes
SHA-256: 1de424518f6fc5be5b5d8f5bb93cb5455a00d61c244acb43e8eb41a094feb746

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