Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa17ee26d903dfe…

MALICIOUS

PDF

92.4 KB Created: 2021-09-07 03:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b9784f4692ca05bd9f4b3502e33edff2 SHA-1: d70d16a70a5290698cd117b12656b31ba8a376ec SHA-256: 3aa17ee26d903dfe8f1f48466c619c83ba001feac214e640b626480030478d8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://infrive.ru/uplcv?utm_term=astro+a50+gen+3+xbox+one+manual PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8efed090d0---jevutiwezatemoreguxe.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/vaxamudimixebafipi.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/nutonememe.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b08347e7b---nozoxuxeditomaw.pdfIn PDF document text
    • http://w-mill.jp/images/file/nivinajexugagatogaw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/42d0f072e5c6a8d62c9986015a5d3adb/84394730350.pdfIn PDF document text
    • http://hevolta.com/upload/file/fapuvanulefofanowul.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/25736948882.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/dapivuletuvoxitesopifika.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/75pn5jtgoqidt3t71ntapl79kt/85127877473.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d403d217---99556672731.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/44826721346.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5731e9307---43672239835.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/vomumiwesunopaxo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/rupupefabuweruliv.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/movigosujamalikenakib.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/zubewomenazuk.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/nukazenizav.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c710da29a1---19552595092.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/86914172386.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/fovufazunolupisadiju.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/qfr7j85i7ntvtf2tq3c58pb519/witizogadexizamotaxab.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/eda3b32c480d556fbf829dfebde9fb9d/katamununizegevasuwifebaw.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/65394129215.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_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 22452 bytes
SHA-256: 0566bd1fd450f890c3ecc5b98bc5e18308030dd90a1546f796dfb57c80b8173b
font_01_sfnt_off000131bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 11108 bytes
SHA-256: fa87b89c2a290fe7793eb51458bad9c9c535be60a980ca709d98529ea65794dd
font_02_sfnt_off00014bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1