Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c96ffc5597c344…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 10:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7b07087302bd6fe4346db0be4c0268d SHA-1: 4f9c39ebad2d01ed6249866bff451af4641e1270 SHA-256: b3c96ffc5597c344e8b597a003f556e7ff36e30beed2e409213736cff7cf802c
176 Risk Score

Malware Insights

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

The sample is a PDF that impersonates a cloud document lure, aiming to trick users into clicking embedded links. These links lead to compromised websites hosting further malicious PDFs, as indicated by multiple heuristics and the ClamAV detection. The ML classifier also strongly flagged this PDF as malicious, suggesting it's designed to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://pixomot.ru/uplcv?utm_term=how+to+transfer+files+from+pc+to+android+with+usb PDF link annotation
    • http://ideatity.com/ckfinder/userfiles/files/11652852903.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/72816192671.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/21119774361.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/96293942057.pdfIn PDF document text
    • http://dentherapia.hu/files/file/pewimotiwunovuzikofatina.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gavilazitef.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161305f27a8f6b---detakokimivuxexanipi.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/novazu.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/nifagufiserep.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161378dee33101---10902756721.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6o41kv9g3vqlfj48aksj0k6ea7/mumowavikizedipi.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/94732203717.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/47303006246.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/62389769150.pdfIn PDF document text
    • http://a-pluset.com/userfiles/5674595472.pdfIn PDF document text
    • https://kermanrooz.com/img/files/92762101705.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/48567874954.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/68416067892.pdfIn PDF document text
    • http://strandedtattoo.info/file/vogorumumojalere.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/57618910367.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/jovavasujabimevimuzepo.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/88905007837.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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 16832 bytes
SHA-256: 2591804b1da3e2024097bf5b8e0a1feef804f4e32b37ae3ed5bfb87f04821c42
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 11200 bytes
SHA-256: 7dd09b35552e8751fd5906727ea1ee889636bad1d68fa463cd6e4a1495a512d9

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