Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc15eba249e54dbf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 16:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d94d3283944f4701e78e882b8cec9278 SHA-1: 389ac82688b696ad555cd3f461eb84e164a1b0b7 SHA-256: bc15eba249e54dbfbcd22133f5b9f456b8c4dcb16766a65c8aa7257224cde5dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://weilandensemble.nl/ckfinder/userfiles/files/83863188141.pdf In PDF document text
    • https://airbays.com/userfiles/file/99994313034.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/64914106198.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/guzitoxabejasa.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/sl2cj46g2fias45p8avr97jiko/desazanaxozewaka.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe64fcab38---61946407286.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/sofapuponixawodutigiro.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/kojiwawifedexopidu.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/45775200146.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f51b440ad74---52629473042.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/73988517322.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/ninajonave.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021061816361173499.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610834822facb---pojuzegafaju.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/14658430727.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/larawab.pdfIn PDF document text
    • http://unsersohn.ch/images/file/48563309550.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/nojagagavetabimijuwa.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/lunudugakerebutukewe.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210816202554.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/765f34aaf9cd702ac4887512b55d192b/zotigupajikeriwiv.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608934e316b4e---pomelajo.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/21924069646.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e48b6d0179b---fiveve.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318a6111b89---nokavuzigipujokipofosawuf.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/10910045427.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/rebejosimuwuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+study+tips+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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 10236 bytes
SHA-256: f1268f46d7475d6370ef9152c9d1022e0c73e893afca221382276b87a202d372
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 17232 bytes
SHA-256: 0dd70cd2c321b413739a73e7bd65f8bdccdf17f35936e03f7c29120401ad9344

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