Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd30c2acc1db919…

MALICIOUS

PDF

96.0 KB Created: 2021-07-16 09:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 5162e283bf616169c0e2264b9010f94f SHA-1: d85197e967a1100ae4763f26e82e3a100c034eeb SHA-256: cdd30c2acc1db919c1e6f16e981aae49a2d5f2b8ceed4a6e8397b3d4b3e2eb11
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV, specifically as 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3878

Heuristics 5

  • 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
  • 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://rts-3.ru/upload/files/50239278917.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a338e016a3a---74434594679.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609972fc9647a---18130780400.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/991onrsl3m8fqsk8m6n9uq7lnv/toxakamorajuvevapulupem.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/pixinenijewisamopugim.pdfIn PDF document text
    • http://ubest.ru/images/file/64999610430.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210703_46CC57ED59C88283.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/64617423424.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a193e965b---jiratomilamevobo.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/20394494263.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f0d0b168---19435337682.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/koledenobulexute.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/zolino.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160790e49ce4c5---32258123861.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/jatabadebibulutipudiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f082e618d2---lelifas.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2da15dbf2---vuworiroj.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/xiwobijaga.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/11304614943.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/khg7106n1mt9uki8ibn6k0i4s1/wuvewedinulamawakewixi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c1348b1bc---kivuzunuretoso.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/vibofuzagegojuxirerap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=port+of+spain+to+torontoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1D 10176 bytes
SHA-256: d1b9ffc89b1312ec077ea7c36c6733069ec8a61cfa5b3ec40b324ca9b3734c91

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