Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9d058761749894…

MALICIOUS

PDF

88.0 KB Created: 2021-08-25 12:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1305a22058a9ed89dea68f77085e46c2 SHA-1: 7a10b48857da58b1238757c4acb4732e1c64c499 SHA-256: dd9d05876174989492545491c9e2c8f8eeffb0ff295c161e52e961ce74947d72
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious content, potentially for phishing or to download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082be1d60f18---62706184740.pdf In PDF document text
    • http://sy-smile.com/upload/files/jelaligat.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/murilude.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/63890671123.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/65791778714.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6d3233368---losegisibobinoj.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/bixokumubiv.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/d4b4df8d53dca56dbcea9a1ad48a8fbf/17292864758.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2kef2866759hmcpinikg6um836/kesozijuwaned.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4d804cea---wogoluxixewagenataveve.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/21817249712.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2621a9fd---7944682705.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820ca40e694---6667049823.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113788527913---77046617046.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/tepelowilaxidifosazaduwax.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/83140446580.pdfIn PDF document text
    • http://belst.by/upload/file/vipotebuxeguzeme.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/99650991248.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/71254350080.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611d129dcf6e0---gopemisifatodufenizapej.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/75971195846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=present+continuous+adverbs+of+timePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 10900 bytes
SHA-256: 4cf2bb0f2d6ebe698104bcdb8c7d6a59ea726baecc659b29a64c6c68e1fdbcaa
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 16972 bytes
SHA-256: 38b619425ea4bc493b4e365231e1c01adfcfa7e154e01e2ce36c008b3679b2a3
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_03_sfnt_off00013797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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