Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd41ede3b1e3d30…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 13:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93fcf9d648088d0bc662daa8da71e1e1 SHA-1: 240556b900daa09e04c05cda31d81dfb40aa1615 SHA-256: 9dd41ede3b1e3d30e1677af2b74915061be841cabbb6ee8fb252a2da11bf8238
212 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure that instructs the user to copy and paste content into a command-line context, indicating an attempt to trick the user into executing commands. Several heuristics, including ML classification and ClamAV detection, flag this PDF as malicious. The embedded URLs suggest a link farm hosted on potentially compromised or disposable domains, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://xycrusher.com/d/files/dakamafolupunatuzonuxog.pdf In PDF document text
    • http://tonyprins.nl/images/uploads/file/vezutojisokilitoxepuzo.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/69972813879.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/kapudiw.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/86444098510.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/majogibosedad.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/29857773557.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/udcos8ckjdgpj90p4ouhotmvoc/safunotagosenejodalaret.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/zigoferuwusejazikufel.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/16971052375.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/pagolopefik.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/4969420697.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/riwamobeb.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/wafebezitibere.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613642e7c5627---73672630656.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907192552.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/nevukifinelutefas.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613302b109a90---97724774028.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rugogugagejetegomuteref.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/mifab.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/wizinewinomuw.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/mumamolamikop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=create+apk+in+react+nativePDF 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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 19048 bytes
SHA-256: cdbcb687ef5dbc6c4eb335f3d5e7f76e971fa0854dce5b040f01e76643f75123
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 10220 bytes
SHA-256: 685dc5887a7692037e391be4fa55c501eb2a62edbf9641b2e40156d2f8cc2a88

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