Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbead0e2c42b150…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 06:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d7a354425f5ed15a8fdad8ba21a62d1 SHA-1: 7023d15c9a36cb247315a6e63c73d9988cbcf448 SHA-256: edbead0e2c42b150756b81fed3f959a6180811c5fad1c9cf823bbf2c21ccd514
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document that exhibits multiple high-risk heuristics, including lures for remote support tools and browser extensions. The ML classifier strongly indicates maliciousness, and ClamAV detection confirms this. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a social engineering attack aimed at tricking the user into executing further malicious actions, such as installing malware or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://deforma.it/userfiles/files/26615908534.pdf In PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/77109449170.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/18333019522.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091306313456.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c682af27---81177098165.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/xavukapesoravarabobokup.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/posaxakonewuvamakiw.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210912070449.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/vidizalinawujemaze.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/lefedon.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/27565581308.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/55280208791.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/43421996080.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/nu3homdcsihsiq067n8kddba39/nuxapajefoji.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/buvitexowalurekekesakofaf.pdfIn PDF document text
    • https://melz-feu.ru/upload/40679210533.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/befexilan.pdfIn PDF document text
    • http://kyea.org/imageuploads/dutajubijikezexirakezow.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141639a5154d---83344306810.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/koxoda.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613589bc0444f---fusuxikenaragara.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374c55efa74---midoj.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/40746298091.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/18375601661.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210903064556.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c4311197---kaforegegurananelegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=can+we+take+remote+access+of+android+phonePDF 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_off0000cd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 11048 bytes
SHA-256: 48d95ed88c6f25aa6dafaff144a0b48f1b050151bb6da9f5f3336e9eb7f885fa
font_02_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 18968 bytes
SHA-256: 06c0ab9910c893fabfbc9e0f8476206c1880f493961c31e9a8a3c16f1251f320