Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92575310321bd15…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 10:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 09db59bda6babe16688cd2c049a71972 SHA-1: 0de37e78ea0c12a289fb8bae227ce33d60498644 SHA-256: e92575310321bd15f48d34a0df177faab589a25bd6b98aa5d54b14ddefd8433a
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update, a common tactic for credential theft or malware installation. The presence of numerous links, many pointing to compromised CMS uploads or disposable hosting, further supports a malicious intent to redirect users to harmful sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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 http://thingsantiquesla.com/userfiles/files/52026450307.pdf In PDF document text
    • http://sro52.ru/uploads/files/tefedibusananakosiwitem.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/41517263540.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/xuvikoxopuwomevoje.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1d7c40ac---tibolijunabirodosebuti.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/karifasi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bb59f3rvcmk2r3qtp67o4er9r4/5201004880.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/14253568671.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3817819a7579992823360791aa3576d5/78300854202.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wupenakanopoposisoruzata.pdfIn PDF document text
    • http://elitacasa.it/images/file/14448326417.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161440c18b40b3---66498747758.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2e921eb0b2f8a9d644708071852178c6/27245396110.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jinekuneluxija.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/32056960266.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/71346605810.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/mepukuj.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/kovojex.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390d700bb55---89824349668.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/remusorizofekizuxomo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237a319953---venenulab.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/45669938201.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/20031404969.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/11c58f793094a126e14aa15ec9ecab43/25855162173.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/xenewa.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/pivemutavikekule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+run+android+on+macPDF 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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 10364 bytes
SHA-256: 71f244e399bd5e7fc4cac9d1ff610cdcc463cb6a6b0c4a57800a307dd038aec9
font_02_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 17892 bytes
SHA-256: 3866c93fbce03cdb632f3cbe6a9c9d1f2b8cf491ed2f36a0766c450d32cceb1c

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