Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccfb0e8d39aa1dc…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 04:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 89f7f11cd2acaeb5b1b0465a7f5df373 SHA-1: 91fe85fb722b70a5ae621e1e8b3c2e705a04e390 SHA-256: 4ccfb0e8d39aa1dc7a8164104006e22f931cd16c7ec5221f15f1c14463d59a67
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d21f62069485a838d1d153439d5bf227/11911616774.pdf, are likely part of this distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://partner-support.net/user_data/userfiles/files/91427235721.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6982d117999646ac373190d1e90bb59d/kukog.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zodepagemituzop.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/74521835854.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dadoxaxefej.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d21f62069485a838d1d153439d5bf227/11911616774.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/fejovel.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/r7bqncg261r0htta9unr3tcls5/megowinejolixojedivukegu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56116f0a45---jaravoniwategunodibojet.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/88473968570.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/85191703682.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/70072869010.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3c65a9c30602e3819d0803ce61da4db7/46687255422.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/63788464932.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jdp3i0q9d50fnk0f94b85itdq7/gejusevisidare.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/xizamumaf.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/famitizum.pdfIn PDF document text
    • http://chpcentre.com/files/file/siruruliz.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/letibigi.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/miguko.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/dononux.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/51925914752.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jrm3eu5re51lvsrrf4vkjbtmhj/74327340048.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/gexowesuboforavuveref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tentacular+thinking+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0475076b4---32848477614.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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 17020 bytes
SHA-256: d3be1c711c42c56bdd7eba20d497f4f0aa49dbbb9f7002933da2e9e14f471d4d
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 10768 bytes
SHA-256: e22d8545d781b317357f16838d1961cbf29ff6432b7fd0a3a157577db943de6d