Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7f2991275f610d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 05:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd0317c09fc97325a39fb32004cc3270 SHA-1: dbaf3e5881a76c8c93c2d659e316d57195934cd1 SHA-256: fd7f2991275f610d8188a697c91baf05181822b73a4ef5bbf28c15a9c47ff44d
204 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The embedded JavaScript and the heuristic 'SE_BROWSER_INSTALL_LURE' suggest the document is designed to trick the user into downloading and installing a malicious browser extension or update. The numerous unknown URLs hosted on compromised WordPress sites likely serve as download locations for the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/089f0e50bf441d6f9f669fa8cb6ccef0/95023221178.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7332150ff55db7a7aa04bc9fe28f5325/89237525696.pdfIn PDF document text
    • https://coil.hk/upload/files/pasixexisaguzo.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/viritariw.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/saxuxibab.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/1604206097.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/54142988371.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e2687eea5fceab8642af2e098f3633ef/mukoxiwenerosakuwekiza.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/61812470411.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/98944315657.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/bokelagepofitifalatinasu.pdfIn PDF document text
    • https://allianztc.ro/files/file/91208140781.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140339fb94f3---gagifona.pdfIn PDF document text
    • https://baongochoa.com/upload/file/77653804746.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/tarexifonafa.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccd471fd4---96160297032.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/mamoraxazeparisifeket.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/jenasifovifi.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/17882426916.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/kefawebi.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/vodotuzufijumerib.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1ad51e079---sadalezoxetijufizufitevo.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/59442483487.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092005284335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dolphin+hd+browser+for+androidPDF 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_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 17792 bytes
SHA-256: f4033b47d71c52a8e9cc91186e66a66120a8dc2c733ccf7c309526a8e23fbfb2
font_01_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 10724 bytes
SHA-256: f12d4811a43f4cfd8e530afac19b1abd8b4ecd497843f082dbba18708259efe7

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