Malicious PDF — malware analysis report

Static analysis result for SHA-256 297264bf60d158d7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 13:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec19d8b557d3f2afe9ed840a4868c1fa SHA-1: 386be768b590134130b452577c8f7aede7316b17 SHA-256: 297264bf60d158d75cad41ed8b376d16d8ed161033933d3201b2a7cf87433ac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k7806jf9cnqelcsaudj2dqglg6/57343181692.pdf In PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/pebibiwetukujope.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/worasu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/g25ljfuhhjp86qa13lbq5j217n/94883093070.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5c07016ab---82022531737.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/89865839041.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161417123bc5b2---pekamegobobiraze.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/4575595885.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/84917070594.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/tinemunenekiludop.pdfIn PDF document text
    • http://keitbg.com/images/files/10217099512.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b13c68ff---toferofeku.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/mibisuwipifop.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/11567363846.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/87999740884.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/15678661569.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/novotepok.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/73575377364.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d864bd3165b767c448d3da0544410d79/jabolunejevizupijoma.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/pinibepemo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141729ac86ab---7278967529.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/87419338722.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/jugenufapi.pdfIn PDF document text
    • http://apvn.info/userfiles/file/pukiro.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/beginaguwotane.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/17421796864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+candlestick+course+steve+nison+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_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 10940 bytes
SHA-256: 1a17f5476f2f5c10322dc2b369ef1f5640528d3009e2a6819ecc7b0352dceab7
font_02_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 18100 bytes
SHA-256: 7446a4996c2bc2ab21946f3859b3290c73811e34416dac46019e7ad3555d030c