Malicious PDF — malware analysis report

Static analysis result for SHA-256 c287c1a727921e8b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-06 03:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 92faad03d523bfc8a94fd9072e5adba1 SHA-1: 6a3cd226174d66b22ef3aa5766688a9efa0d00fd SHA-256: c287c1a727921e8b05193b2eb595f4488a9bb4a8ec30c9e4358b612790c13503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=que+es+educacion+holistica+pdf PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d29a03974---kodemigenepag.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/90684149238.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wakuker.pdfIn PDF document text
    • http://melhi68.com/clients/69549/File/ronir.pdfIn PDF document text
    • http://ha-sine.com/d/files/46874588669.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/16536665767.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/bedavixov.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/vagixidim.pdfIn PDF document text
    • http://coumert.com/images/file/xizegam.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/lobovetifusozuzukusite.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/17955635636.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kqcr9map0fcsn78o7l4ukveps6/92419659006.pdfIn PDF document text
    • https://priscar.com/documents/files/lokuwow.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/68477793280.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f089f20eb666c0a7a4c2fbcd652f7d3f/745121684.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/kipedebekujowidinunizagil.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef09a17292---dopilogenej.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/20890560180.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/posibojumudegov.pdfIn PDF document text
    • http://186086.com/upload/files/45722089137.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/sujili.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc9d58d01---3003138558.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb70488c66---tenefa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c96fcc0883---vejagifujasoxet.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/tizawinozis.pdfIn PDF document text
    • 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_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 10776 bytes
SHA-256: 219e559ed96eb50d50bebad25fc0d50a871b19b9b76a8813e506ba297b92f9ce
font_01_sfnt_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 14528 bytes
SHA-256: 2c7c685e9dabcc30035564acf19c603e01996ade28228fe477bbfc1ae5ebb808
font_02_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1