Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f23e91511eba713…

MALICIOUS

PDF

132.3 KB Created: 2021-06-28 11:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb00b82f5a5e0f610a2dfdbe2a863f5b SHA-1: 2418e1f26d882908a0d19df47483195966a3fb26 SHA-256: 2f23e91511eba71360e10d039a969dc1fdac5e1632866d65eb8d8212bdbf8571
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b70895d1268c0668a1e89df76f8d934f/vogise.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8efbb60a09992eb01742dfcb6f47f5cd/xisidodalunonolikib.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210626_351277FBE22E5B34.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e19a022a2ba14a9965e7feba7056300a/60344590538.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a486588d72e2b2d9722888a36b4b27bb/5432749868.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/momevukazakemi.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a73cda82cdabd1b9a3da27b301fcb5b5/mafasurifarutanezibaf.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608977f973d57---mifazusozoto.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/1c8d80999da0e21e61427fe317a010c4/gejabe.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/71668655983.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tazapo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2fq5hl2329jj731gdmbui29all/64084426416.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160788104d4055---63268132226.pdfIn PDF document text
    • http://proxima-design.cz/files/file/2776842438.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4rln8cen51s6dc1edhtcsvpknp/32689949678.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vopodigajererim.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7c3e8962---72185956880.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb36cc8d2---rufupija.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/kosopiwivarajosa.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9d1ff0c9d---84135338269.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/50cfd6a6a0d1bb149a57818bebb8a003/96367939064.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/75212920933.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ad9c1cb221a8f7bed2d63e62941bf98c/40929040028.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/45049364345.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a68024420cc7175a2072b24b02604fb1/36618080035.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086049b89e52---xosuruwusageke.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/994970ee8cd73d1aa23a2b8577aa90e6/juruzotexiteki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=naplan+past+papers+2008PDF 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_off0001a29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A29A 18472 bytes
SHA-256: 0f9da4eeb8cd61869349a94dc4ff4f6f1f2a30faea7a63a7189dfd39a2d78973
font_01_sfnt_off0001d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D35A 10460 bytes
SHA-256: dd9740c9b48cf5c8155cc0efe6cf9db92ddcc286364ae7cfe3af6ca3503bbc62
font_02_sfnt_off0001eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1