Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e1d963061b77ce…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 19:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 29f557e52d8eb8d584109726c35fd0c2 SHA-1: 9ef1ad5fdf129d52753016f47c021358f8f77e46 SHA-256: 84e1d963061b77ceda6de2e6705a7e13ab9e0fc79a3f89642bc4469ca790b190
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be part of a multi-stage attack, possibly requiring a password to decrypt a payload. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6ef6000488f6100c7c2953f92477bfbf/zumelanulem.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2e59f4b0---49149877946.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/noralexabuge.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/28163907577.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tageluwuzedu.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/75625802673.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pexizifepobas.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/98624700262.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/59738518031.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/70161367223.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/24788128289.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/93679383784.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/nubewuwul.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rsomle9hdm9jm7ndete5n2c9s3/47136137548.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/duvutidupewexu.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/reniteso.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/jifeg.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/juxavosolufogevawuxe.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/g9e1iqo4hdpj5liqv8aukn7rt7/60123523304.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160915c31351f9---72228451661.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/voxaxofaraduwegisageja.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/47871030440.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8e9e2acc755632cf44647af677820dd4/5907699439.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/kokuxerabisofunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+encrypt+a+pdf+with+passwordPDF 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_off0000c2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C4 18268 bytes
SHA-256: c1fb4ca40ce0932e546ad997d66afdad3ebf16dc71cd1af27e68512ea336994d
font_01_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 10864 bytes
SHA-256: de4e319bc8d93cc65b3e8a78d57e5daee264cbf1b95cfcbbe7d62ddbcb13f87e

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