Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb955d3e877a0d6f…

MALICIOUS

PDF

59.6 KB Created: 2021-09-25 07:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91e7e14be92f18c8659a4bdb85120d12 SHA-1: 2d349437bc7951f93b44705910115f7e27533081 SHA-256: cb955d3e877a0d6fbc0b8845dd9cfff26e93cb428f85b5f4d7a9ac24d748b359
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature. The presence of these links suggests an attempt to lure users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4569

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://beaszemin.com/files/2397755175.pdf In PDF document text
    • http://lammermoor.net/imagenes/file/1685126883.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/88775292245.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4qftpft53v8qss8eg0rldcq5c7/wevijenudogexitiwape.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/fodepalowudizazitemu.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/pikenatiwoluzanuwa.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/45155961469.pdfIn PDF document text
    • http://sns.hu/_user/file/jafuxumofifetafaresil.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/87696519782.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/poravuwuzizitaxelajed.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/rupano.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/vudaviwilolipugu.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/68396562218.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/kuruxufigem.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130bba9ac9cb---83484918480.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210910_EB77C7F4B4585C5B.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb4b2dff5---dapeselavitizode.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/pinigoxupavapobisig.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/dezetebi.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/28141160561.pdfIn PDF document text
    • http://www.bash.cl/media/file/fovepevadakijo.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/2165277295.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/lizedinudobogufebeg.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109231349078761.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/viwawisodutegokeninezado.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148743437c2e---fojupido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=psalter+of+the+blessed+virgin+mary+pdfPDF 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_off0000b2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B6 11264 bytes
SHA-256: 015cc6640ecbd2ae3e5b19c334230b0be16e740e1bbe559037c21cf356fa0abb
font_01_sfnt_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1