Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cf98ca9a7d5f16…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 20:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b88dd2ced8b0746b9335c01a933e26e0 SHA-1: c71949047dc25665a3e87619793aed31a757e22e SHA-256: e0cf98ca9a7d5f1697df3dc3388e3655bec8f6cb15a3d7102c6d0af13257aed5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0946e48ca448d280dc263236aa20fcaa/92533206943.pdf In PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/932510fc7e8eb4080c4fd30537876604/44839691204.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/muwoxifadusitamamaneb.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/metux.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2b9855b4f5b468aea861b90c08f3a2bb/jalamodeguzarerene.pdfIn PDF document text
    • http://01host.ru/userfiles/files/75563750897.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/24199960219.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7edbeb8ee---limewivenowapuziwunodef.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/94661595094.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076062a37b34---8875925400.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/22990199271.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/begosokipe.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/87227548631.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/papefojakarubituke.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b063444b1---91855907011.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/suxoborutavigitoduzamo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d14ec20c380306cb1182ac1b2a88b318/lagunomosojitotovibex.pdfIn PDF document text
    • http://apple888.vn/luutru/files/sopoxobomikefikile.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb88d0dc73---titasoxosivojigosig.pdfIn PDF document text
    • https://rcot.org/userfiles/file/jakele.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/saxejesikaxalerowelumere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=descargar+manual+de+power+point+2013+pdfPDF 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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 11616 bytes
SHA-256: e56fb8d5e2021b2715f7cb4775e4cf64a7cdab290b9939a7ac589822c5121ab7
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 17964 bytes
SHA-256: 5375fee982a0e943c48e7b3ff03416bfc119dce87ca64a2c357d9acd16734ac7
font_02_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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