Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9f82b23d19b34d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 22:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c62a678a1a636dc6246ade3e435e6a33 SHA-1: 733484df38a05e19487fa8449b9d61d31bfd94e0 SHA-256: 9f9f82b23d19b34d7f6af4a52612230d13d6861bfc2e7938e662a89876ba64ed
164 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, hosting numerous URLs that point to potentially compromised WordPress sites or disposable hosting, designed to lure users into downloading further malicious content. The presence of a 'download button' heuristic further supports the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5u51nal9fk8haom2hbjl8v1um3/kixemugibapato.pdf In PDF document text
    • http://showplus.ae/userfiles/files/99786937253.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/44033072560.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/lamer.pdfIn PDF document text
    • https://msvadba.ru/files/file/42761577808.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/xawekuk.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/zinatase.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613264caec1e7---givuzimapofibiral.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/2531178241.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/8209294452.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/60727486965.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210905084510193.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/skrgm9gab89bv1ios4je4sj9ec/segupoxiwodamixogimux.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/25622176228.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/52510551154.pdfIn PDF document text
    • http://tzsunup.com/upload/kumutuwajumikonefore.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/94987031937.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/fiwarefepalizemapubiw.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5319d1237---58051415376.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/14592667373.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/rimapoginano.pdfIn PDF document text
    • http://poorclarescork.ie/images/zakalorutigufode.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/84085066920.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/tinepatemajeritasoxamoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fpse+patched+apkPDF 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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 17940 bytes
SHA-256: cff9ed562ad36cb423841cca9290ad4ca3ca20e9ddaaefef740030a81f08d9e2
font_02_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 10220 bytes
SHA-256: d2740c72e7cb1a41b2fc3d1646208414f3f3e5ef7c091721e4fa57f0bfe6f081

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