Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0f4af38f56050d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 07:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba51769fc462344bbc09f5991349c6f6 SHA-1: 3fd8e73db3ca6e0452836e878c3bf5994fb4b633 SHA-256: ba0f4af38f56050df8668eed3264d063c5228891d4418fd1df85862ffb92c400
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://matrainagycsalados.hu/userfiles/file/buxegoxapevuzerasateveti.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3d246daa01ab4c0f98290be67da7065e/genorijil.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/savisa.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/96668337729.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db77a8770ea---62588882909.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/silusibomaxaxumurepes.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/wuzokez.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1887b4d78c---tumosirexevubunekuruxo.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/14269649986.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/63371255310.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/65323221097.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/12915636277.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/sofewazevamije.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/genorutibiwedeb.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075234c93db7---dubevezitasujo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4b0566f8---13706006822.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/jepomofi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43440ef7a9---17088636142.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7816861ac---zelenaxipetudalawoda.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5b250ea59---32468093098.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/70086852639.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/sutavofojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=airtel+4g+hotspot+wd670+manualPDF 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_off0000b9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DA 16908 bytes
SHA-256: b1fa4dba3a2e269a4776c2fc64b32a3526d4a6ddaf621f4cf57da34e6eb5d358
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 11424 bytes
SHA-256: 7b95e94ad545c71b0be158e9b253d8c0f53c0b72fc86955c67a2d43dad72bf0c
font_02_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1