Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36c251a4bc12913…

MALICIOUS

PDF

259.9 KB Created: 2021-08-03 03:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed3345caed88abb4b2e0cb725620e963 SHA-1: b54f57f6c78a715ffb158f199c3493171b5bc6ff SHA-256: c36c251a4bc12913b9f628b6e463acec217df1453ce64e1f65e8b87edf366639
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious URLs is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8348

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cmtsport.com/pliki/22917111749.pdf In PDF document text
    • https://olterus.com/contents//files/88680092778.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/50061085748.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/debaxal.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091184924c8c---zipegadixivizun.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/jodowid.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/wenujuzajateputixik.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d923c1c2---28601488781.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/88262159317.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f67faf207---vipanafakuli.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/78260518333.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4812c7ee---fevofiwa.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b20105abb54---98105442238.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/dubilixujufinegobepojat.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/riwejevuguxo.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/90301918462.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5242239c9cdd4f4e571c41e5faef0260/71111769632.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/sktdgr1jbp8gehcftv8hgt7ifl/zotas.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/23bd02efb61eb87d8faa46c9df0c28a9/7866819272.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107270848137023.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/4302301583.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/82667203345.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/bitologilonujenireda.pdfIn PDF document text
    • http://wami.cc/data/files/5459718754.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b769cef9---sagovowas.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a6f839ee9---ritutenukevumudasanevuvig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=diccionario+expositivo+vine+descargar+gratisPDF 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_off000394de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x394DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003acf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3ACF5 10812 bytes
SHA-256: ab5ed48812fb3928aa83a1d1a696a465d44d6653d30a7e8dd263cb56ee8b127c
font_02_sfnt_off0003c5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C5DA 21896 bytes
SHA-256: ade937892a9484cf14fccee0cd51263871d9727e865b0aabf9dda276069de67c