Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a1ebb39b72fa2d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 14:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ceb79342b9b92040ccf1b70994aa761a SHA-1: 764a0d236e18e8759b7e2bc247e63c0b7aa623c7 SHA-256: 40a1ebb39b72fa2dfaf7750539f46a4494697498e14c898d6259ca9a935f9dff
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension. While no scripts were directly extracted, the presence of numerous embedded URLs, some pointing to compromised websites, suggests a phishing or malware distribution attempt. The document's structure and embedded links are consistent with a social engineering attack designed to lead the user to download and execute a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ab0afdf34cb7e21f8bfbcad6786844f6/55966110476.pdf In PDF document text
    • http://xyr59.com/filespath/files/20210910192618.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/20899957836.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/pamodorek.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1cadc45dd---fujipukemezasamidumuva.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210903_2A334129B9EFDA30.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/19753861374.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/58493117555.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/dexilawoletilije.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/bonusate.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/midakinoxigojo.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/worabaxevumosa.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/wiwugexirijekebulawiwibid.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/45991590338.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9bb11d221---35261174363.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/65400687952.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/76315526455.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/7079656575.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/38752308419.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109062122085957.pdfIn PDF document text
    • http://koddous.com/userfiles/file/44434045663.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14b6c8416---63602104410.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614007a722948---70937997479.pdfIn PDF document text
    • http://heizler.hu/files/file/sakekubomifotigumuzod.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/17528135174.pdfIn PDF document text
    • https://parkettworld.com/upload/files/33945485189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chrome+web+page+for+arc+welderPDF 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_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 10860 bytes
SHA-256: 2c86423940399b2b1b8e2af9a74b74279a7ad8d52c36a6c70a83f444ee31e280
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 18964 bytes
SHA-256: 7a3e1a28695cfa563bb6bb007c0e1351cc054979032f79b548ac1b0e9ae1b223
font_02_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.