Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec405b95b4c0d310…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 10:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 290c760eda817bb8b98d30fb89cd2288 SHA-1: d7f5ce8776dec14bdb9a424f3a85a0ca8f6ccf82 SHA-256: ec405b95b4c0d31000b07e99643d3eb228f9198f556c2b79173d0dd6aa0b31de
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huseyindurmuslar.com/images_upload/files/53790444203.pdf In PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/ramamukakawi.pdfIn PDF document text
    • https://kratky.eu/files/file/69154468351.pdfIn PDF document text
    • https://vzglavniki.net/data/file/wopetewagedudaw.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e2cb54c75---25593965210.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/233fe44a19eaf2e3eaf413a0f71e5ebd/nabebawap.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/xujuvaxizituje.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/88317251655.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/5139977051.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/55327125076.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/80285926568.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/99910625425.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/piwijilejer.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbb966121---99962753055.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7dd0520ab51cb5e308671cf17bc6cb1b/buwovaferoxokab.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/14259345041.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/2662491885.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/78361760992.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/fufukubewebafetaxo.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/duxar.pdfIn PDF document text
    • https://congchung7.com/upload/file/nimopafofe.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a01e99ab53ca592c47dea745be9ed5e4/83883267427.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/45848529983.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/rofivofijomazuwu.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210919202439_93nacw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=redmi+9s+processorPDF 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_off0000b501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB501 10476 bytes
SHA-256: 7ed958a074fd0fd16d091efe72644a803b7febb63a5dd4bc439289cde72d9ed2
font_01_sfnt_off0000ccc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC5 18288 bytes
SHA-256: e4d32bdfa4a6a92969f16d7c34e04934bf690c6c580573c62b50ac936750d041
font_02_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1