Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d11ec72d24d8774…

MALICIOUS

PDF

191.1 KB Created: 2021-07-23 14:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1408de82bffc6e6ca0fa5dfc8cde8c2f SHA-1: 88a7dd545ad13cc622a2a61c880f4de60efdc096 SHA-256: 3d11ec72d24d8774cbbb4a8c328745e7bc49a1bf436e11364b38a8e65b7e0a24
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9475

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 https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc97dbc1154---rilekigilip.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab09bc7b1---9454235048.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kataj.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae9bd5434b---jitemixip.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071fab3b65b6---45957094064.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e8202530d31a7dd34ba0d38bb4b7aa0b/88137372196.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bt8ddic27s5hau6ur88olsvn36/junakazuj.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/31799678945.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/julajirewujazunifij.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/12277160442.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607795b4e8cda---46228016871.pdfIn PDF document text
    • https://stopserv.ru/files/file/vibesub.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/90198813486.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/13365585170.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5a205d85eea0ab5b1e4b69d79629c188/42630377405.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tc53blslan6bt3n299avqpcrp3/tifebenuwaguxuxizosoka.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062521263273499.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/24304165510.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb08dfa8f00---56093173228.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f519e6d84ec9646b455f65c6dc1f47af/vozowi.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/siseninodemoditamomabepi.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/78105116550.pdfIn PDF document text
    • http://www.centralperdana.com/file/kibadosipakanabasov.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/padulotimidavuvukabug.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/mugizitiviwameku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+point+of+life+according+to+the+biblePDF 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_off00028c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002a492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A492 11032 bytes
SHA-256: d441bfe12ec8d33611f1f1c3683b2767a6aa6d52317a917f6dcb6d39533ec6f7
font_02_sfnt_off0002bdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDC4 17752 bytes
SHA-256: e1e5e00517a92fb15aa5f39747256362bf8679c3f75443f6a27ce6bd33146b52

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