Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ca2af5cef854cd…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 00:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64ecd0654ba20052e0f6bb4fe5922758 SHA-1: 0dc59c40883a4672003c80b4063631984de64a6d SHA-256: d4ca2af5cef854cd4367c7fc4c52e4cc91088e63209cd6b9bd211cb5fc34a230
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple URLs pointing to potentially compromised or disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely attempts to trick the user into installing malicious browser extensions or updates. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript and link farm structure suggest it's designed to download and execute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/s3flumauj7jup60il1v76pc094/97571748045.pdf In PDF document text
    • http://dermalab.pl/userfiles/file/bitubi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c5a5591b90010dc2838c9b490388de37/jesujigarumuk.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/zakakagulufepomalozu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c13b46c481---5943400564.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/xegagisagawanukewexoje.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210812150334873018gefz8a.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/nilufiduwexuvapadufisig.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af87edfbb---80968690607.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/lijezugusu.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/pabapafuremarijigajis.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/xubiru.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/94836412437.pdfIn PDF document text
    • https://rintrans.com/files/80912713663.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/75206946551.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/53721379375.pdfIn PDF document text
    • https://sealskinz.ru/files/file/78037508001.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608635690571b---tosafirubi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd576a302---59034941521.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/gewolorexekif.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e4dff4db1f43e1efb37ae377d6e62de6/4815768774.pdfIn PDF document text
    • https://datawire.gr/files/files/38424936288.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cg2sjsf7npua98okc2ljl00t7o/94382582233.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/86118425834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=class+10+history+chapter+4+notes+pdf+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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 17932 bytes
SHA-256: 4ca832a587b032cec4bf7db81ac753f92d69bc7e0abc1a29af395b6078d661cd
font_02_sfnt_off00012da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA1 11200 bytes
SHA-256: 43ef2d8f5bb33d65df159f810e04b9c4b8eaef204ef225d8d152f2f51cc35664

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