Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40dd261ebe84cbe…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 19:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd31c4c0d2051005b27cc9b983717eec SHA-1: aa5b62aaf61da36bb482940be6ef10782b0bd873 SHA-256: d40dd261ebe84cbef6696459c3cb34b383ae7e1f99f9b701e10e50a7b2957312
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://autoandtruckrepair.net/nbloom/fckuploads/file/99940956871.pdf In PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/66217496009.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a17dce04---65569458715.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/bowopufefafidipigow.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/tivifoto.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/lokiraruza.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/wijadobur.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/73504484670.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/29489332795.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/42502721972.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/18613628236.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/76843ea582075e6c902ed5d57d312b76/48972776707.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/medatuto.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/inhc77c1lj2iljtusnh4q15c1o/suzoxeb.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ca92951db---15712638845.pdfIn PDF document text
    • http://unseretochter.com/images/file/26090886796.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/menabufubeso.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062801485670554.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22d16693d---12407089068.pdfIn PDF document text
    • https://noddy.nu/images/file/josugolawifotipobovelifa.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/72050433203.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/vozukamasakuxedozasuv.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608189f49ab9e---57547718367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=importance+of+marketing+mix+7ps+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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 11112 bytes
SHA-256: a67634fd257c3986b57320fe367eb43af1b20a63af4d20f5a7dd8148f3a1945f
font_01_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 17508 bytes
SHA-256: bd018a42816cbdead013af48882edb34069bb9eabfc93ef13b0628347b8a293a