Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43498eec1804ca8…

MALICIOUS

PDF

88.3 KB Created: 2021-07-13 18:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf0bb6e3990bec2e4c8d997dab724412 SHA-1: 852bc42d77b72d71a3ed0141f6016438a89f7b5a SHA-256: e43498eec1804ca85b77cba0c2ecc3d236b547cc4f42158c9f501a74f6c7eb42
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and URL distribution suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r0q2r549tsqai6mm2bocfc14nj/72903642559.pdf In PDF document text
    • https://kaktutzhit.by/uploads/files/pajagenogetomenababefofo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac0837c3b---40909788010.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/aohknmgjum01fuqnrmb5vvaa6f/rerixilebinatir.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/58584818556.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/23040412195.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d406646d153b7cad24751014a12840c1/gizigatosivuzezu.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/tusij.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/lusawasiriwatulasizavuti.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1d081e18---muzejirapafa.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21e3db03c---jajimuzu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19da55148---misofazujoripamuxuvabuv.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dac2fbc1c5aa3712130542ec1d03de52/61087716750.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/32205914731.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/321f93fb723751725d0fa728a4087c41/24984511503.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/1427833348.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/leluvuzafewawaribadad.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/77367541311.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/75331801017.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de64bb8997---jabis.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9fb4a72a---14675639338.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/34e921248c8371fdd0fc9bdf95e11a20/kasosej.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/lamutevimet.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0ef58c447---muwilireterog.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/87078262356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+long+to+steam+asparagus+in+microwavePDF 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_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 10960 bytes
SHA-256: 0f556cf4b6c71b05bfeee7ccb1b4b426ac83c91c2cddec1e77d762e235bb0592
font_01_sfnt_off00010e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 16808 bytes
SHA-256: c992f03d538a6faf428fff6514943b2fd1171aee78611bd9e918e40f46685689
font_02_sfnt_off000139e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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