Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcad424c8d6e996…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 19:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c97d2cb3ce11f88196c1e79720d23e0b SHA-1: 35de6a427b8a8b6d8b26daad649d4bb12a78fd5f SHA-256: 4bcad424c8d6e9961870d15eb5b836f169b8b4ee3e1651e5c65de2686899c751
184 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, specifically as a phishing trojan. It impersonates a cloud document lure, a common tactic to trick users into opening malicious files. The embedded JavaScript and numerous external links, some pointing to compromised WordPress uploads, suggest an attempt to download and execute a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://olterus.net/contents/files/xudiw.pdf In PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/petofabaxakukunewiri.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/81335185227.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/wifafigebi.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/78137974327.pdfIn PDF document text
    • https://digireg.nu/upload/26953114819.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/17785091882.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/fuduvim.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/64110408003.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/77937095924.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/86178751028.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/72114376909.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/12491004636.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07e647a1e---81503941013.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/10561137595.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614091da7fe84---92810584937.pdfIn PDF document text
    • http://szcftz.com/upload/bapoved.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613961dc60265---21516179819.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gabosipenozotari.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/57391268439.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/tboj6d9j8smg5j4vt6ipr421ce/37553495218.pdfIn PDF document text
    • http://na3.it/misc/file/tazedizofitotam.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/kalapiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=google+documents+on+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_off0000df71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 17060 bytes
SHA-256: a909258102e04ea69d421ac9e8f324b642dc34700b9f8b60d74a94f221929340
font_01_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 11100 bytes
SHA-256: b15079db0031deaf23db03ac6b8a1ced09b0a02d2eb439c25f13139648e1ecd1

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