Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff5c5a803e80e32…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 03:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfe1fecdeba5080ee6a08767cfcc5518 SHA-1: 776c53ac207cd7ff6458179405196707e4364ef9 SHA-256: 8ff5c5a803e80e328f4b97d85a6bb3dbeca990a4953dc482b9324cc9b40f7859
212 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of embedded JavaScript and multiple external URLs, including those hosted on compromised CMS uploads and link farms, suggests an attempt to lure the user into downloading a secondary malicious file. The 'Browser extension / update installation lure' heuristic further supports the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pistant.ru/uplcv?utm_term=which+is+the+best+document+viewer+for+android PDF link annotation
    • https://clubberia.com/js/ckfinder/userfiles/files/gulosulapepepuzozu.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/47104801059.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70de97e52---vopajixaresipeto.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/5207338892.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/41982021626.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/lusabewitujibez.pdfIn PDF document text
    • http://only-svet.ru/upload/files/88027144576.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tj01uimgu7sdlgotf35nra5pa3/65843522644.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/rebevasava.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/22976391362.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/58423390290.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/xusokigojubovuzij.pdfIn PDF document text
    • http://neuroxl.com/images/file/kapasuwarekixirewun.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/12916755364.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/minatuvijodosif.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/47124276990.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090212024412.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/vovurutodipokusizidumemu.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/zabevekububorofegog.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec99a81728---74678841922.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0e4d10866471d297b2fb9b70e842624e/malarubeb.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fbd0f410700ff03386e10e55b2c8ccd6/21109683518.pdfIn PDF document text
    • 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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 11080 bytes
SHA-256: cf5db4e452930f4785c7a89d99409df2610a6e742533ed55bee46fd26894e468
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 18004 bytes
SHA-256: dcf23edc5e71dc65ddbec3704c313ef2cfa387e7be80fc174f89eb0adb0eef16
font_02_sfnt_off00012bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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