Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaffedb115a63e8…

MALICIOUS

PDF

71.5 KB Created: 2021-10-02 19:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 02a5446585c3f4013350d7734d81500a SHA-1: 7eb71a252924388ce0d26b9d97ede981f375b172 SHA-256: bcaffedb115a63e841b41ba042630093d802c7d1c5a0c89886f192a873beb5d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/a311f3f3449ad21013228fd3ba99712c/922053345.pdf In PDF document text
    • https://worldcastlive.com/userfiles/file/34755558257.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/17806047321.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/30503936563.pdfIn PDF document text
    • http://aminotp.com/upload/files/58034148091.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/87684039864.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/78699755847.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/cc4f907cb043ba9c38ca695af64ef9b6/17417822458.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/fugokosa.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/tonovelamifazuzofasiw.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/xularuwixuz.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/bipivelumidumovez.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/suvexapelujufamugajuz.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/84vcq756cqaqsbuvcfibjpaljb/nozofejovop.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/37377176648.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/13625970424.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zujotedopefiju.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/saruvimujeniz.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/30377692205.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/68107617499.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/68365483689.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e388a2f8---59117674639.pdfIn PDF document text
    • http://sayarbobinaj.com/file/welofujinilifezavebaz.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/dalofafekot.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/62853085781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=costanzo+physiology+7th+edition+pdf+free+downloadPDF 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_off0000b41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41F 15464 bytes
SHA-256: bd3482b92abea2b8403c0fda833072bb1cb9d4b38f99224925b68aa3f2c063e9
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 11116 bytes
SHA-256: 9f75fd211451277aff32214b70a4262c6a89132bcbd72b78bd4abaaf14211078
font_02_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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