Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e18d6a0260825ad…

MALICIOUS

PDF

86.6 KB Created: 2021-08-06 05:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86c1cfe958da93f535bfde256b7f8030 SHA-1: 3b4d577f9e596e2ca4d4279c3bb598fb5dc587a3 SHA-256: 5e18d6a0260825ad795d735dbf3d364336d3b56c7cf732d5aa9a65803776639d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and link farm patterns, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment, aiming to lure users to compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://catamma.ru/uplcv?utm_term=tucker+carlson+wife+susan+andrews PDF link annotation
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/lr9obh7pb7vo66qggvmt4d9mhv/29536765731.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/wunitulixis.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b714c1a7be50208230aa1d64d376d00d/32562542629.pdfIn PDF document text
    • http://scro.ru/pic/file/lomilavidetinibogusara.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dc8b14a7e---49354513590.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097501ec2bf7---34555643486.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/29862581585.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/92c88c33f61ae7598290f8d0fd21296d/bamozokuzexadotulebo.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38dc47710---pefupu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98ea2f885---jiwunezamagemotizeres.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ecac420d---65378461256.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/suludu.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/09/44886214550.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/13c08382bad7f5d69b5e8481151341d7/febalewojikolijezo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/t39vu146p1t8lvh2letk17udd6/sipuwiliniwuni.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/mupakevadesobilizeja.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/3198227663.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/70144421381.pdfIn PDF document text
    • http://medrea.ru/upload/files/99981300299.pdfIn PDF document text
    • http://rafaelokazakov.com/file/niguxox.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/25806631737.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/bukawaxufuxedale.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7d515f70---40534234017.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_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 17676 bytes
SHA-256: ecbceb44416b5489f65fdf6b3dbbec054dbe6fc6e538b8013008171903c37ecd
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 10612 bytes
SHA-256: 101cbf17ec00f90e1e824151e87277f1c843edab91961da239f6aa4c3828ad05

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