Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a36211f79c6e85b…

MALICIOUS

PDF

80.8 KB Created: 2021-08-13 19:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b6297ba36216b6957d120a614aadba7d SHA-1: 4c93d76130eb86eb564c53b10992f06675a0b6e3 SHA-256: 5a36211f79c6e85b69a0465b695f017fe0e323fecbc5f0ac291844731e0330b0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads, designed to trick users into downloading further malicious content. The embedded JavaScript stream and ML classifier strongly indicate malicious intent, with ClamAV confirming it as a phishing trojan. The primary attack vector appears to be a link farm designed to facilitate malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • 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.
  • 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://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ggqu2pratknpaohb62oh2dpojm/zufutadimavefuxuv.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100bce9add57---dibebedupa.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/rimik.pdfIn PDF document text
    • http://sparkpro.lv/content/file/40074430255.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/46385031421.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/40741135076.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/rebujebajinofasus.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffc819779---depufonisijix.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/8268235293.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/58958303565.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/vofinizisogidemul.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb356e78d---40684604381.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c5f7c6a35---55746929645.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6287fbae16---navarijibixebomajo.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/888079650.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/gixumemozamog.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/tifugaxebitawanopum.pdfIn PDF document text
    • https://tomas-music.com/contents//files/putavejenila.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/zapafaxete.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/3125ad3af6a6ad3e05c78e68045004fe/37369699892.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/bupivigareruw.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wokimibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bloons+td+5+hack+apk+downloadPDF 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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10652 bytes
SHA-256: e744146b77b39f7a558be2aca5602fd4edba005fceafc5a6ac605f2ad7695084
font_01_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 17116 bytes
SHA-256: 7c7994dcf4de92f1e91826dd78990629042e60680bdcb947945e2a777b7b3b75

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