Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd826b57b518125b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 17:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8dc8d70f272998e304ad421715e5c2ab SHA-1: 74414c8c0c2b82c41d1eb637911ad7cfa7627605 SHA-256: dd826b57b518125b1db0d42be455b230ffd3c26fb941832cd08a75ba11e29746
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social engineering tactic to prompt the user to install malicious software or extensions. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, further support the malicious intent of distributing further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=scan+to+text+android PDF link annotation
    • https://springkasteelhuren.be/userfiles/file/4391321480.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/bitodob.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/dowigutexobure.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109091252547005.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/50621142069.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/jadipiwesekopawalibele.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/16305981798.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7d09eaaf0---87004266381.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/42763481036.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130df7690b31---57649885699.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/61819061506.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/7443107474.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/suxijomalizomuketos.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/p60q5drei6opitc81h3m94v8lo/15898918358.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca85797b8---nenesegedaza.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/kufogorolilusozepugivenuf.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/44918539067.pdfIn PDF document text
    • https://network-italia.com/file/95914094044.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/gonugurubumotoronub.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/domomebirog.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/68084551840.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/14636028244.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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 10324 bytes
SHA-256: 1f286aad79c039451c7897e7e3be12ecd7bdb1d9ef05cce410a4dc042ea0c9fd
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 17648 bytes
SHA-256: f2db5a4db19f240adf02272c6ae449ce93fdaace21c6ff16c44bff03e24c63c8

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