Malicious PDF — malware analysis report

Static analysis result for SHA-256 a203809cb6ed56f0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 10:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e8f66b892aa98ea4c8f197ce4677936 SHA-1: 7f1201109cbe58fdbe4aff0bdcc9a47cfa5c6968 SHA-256: a203809cb6ed56f04d5e4d8e27208f4d284d78818dfd48e1a5865c1e1b23fb84
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 a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to distribute further malware or phishing content. The PDF itself does not contain readable content, suggesting its primary purpose is to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b7fcfdab5b5fdd264d358043d5f5dca7/mujuziribibafowew.pdf In PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/019605b4b992740a9a890fe5e5914562/1571756045.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb85d65f3---pubanobamezujuvorugataza.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161301fa536cb3---sezorezezixiwiradel.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/39861097369.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/9488895312.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161361e5379081---41880592453.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/zized.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f86a6e918---supobanunifevavedef.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/10813485026.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/9542937680.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/jagegikoliw.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614435f20d4ee---poxiluxezunuzekavojowuwo.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/vekituredonif.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/gabesiwokatokezezoj.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319876a83f4---14271798064.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/44787886991.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/joxoxilikulubutajete.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/lanoxixakunowipevujop.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/xabozapidumivef.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/masokubevoxi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f32fb28beb---xofeweroj.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/rogogifudolaganafeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+print+to+windows+shared+printerPDF 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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 10508 bytes
SHA-256: 9e3b3caf4ae124de30f5e4d8bd4fea82aea3b1c5bd1c53df1506fa492d4d4c21
font_02_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 17516 bytes
SHA-256: 6fd5769b0f74ecaf7f189bb69c7687e9196e91a86d55bf29370c992e10455d8b

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