Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdd53410c5a92a6…

MALICIOUS

PDF

80.2 KB Created: 2021-08-29 23:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c15ea810de43b13aa0726401b5cde99e SHA-1: cc1345471ffd976267ebec460ed25a9b433a818e SHA-256: dbdd53410c5a92a6d60f0e0173be6c81553ad33c413d01f667859fbe9aabdb56
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, specifically a remote support tool pretext. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=technical+chemistry+gas+laws+magic+square+answers PDF link annotation
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/xozirore.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a90dea3fa---93300171761.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/75045779254.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/31130125227.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/ladebijipomexunususinodew.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb1e50740c---63987901911.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac7151ada---zusuvo.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050500442573499.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/49328411284.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/3846480462.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cdfe056dd---86809497539.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609459d70584f---86359077108.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/58247721418.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda16e1f2f---75896419154.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe2517e7f---71316556829.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/raritemosipofiv.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e65808089b---xalilupijamamogoruba.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/59430232604.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/jusovelekesavodelamol.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/duratugigulefu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e425de548f447097609063052fa60ee2/56239511184.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3a5d901aa2d2e0d7ed7c633ae1efd0ed/birodakatawok.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/62690295395.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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 10964 bytes
SHA-256: 455ea6de7083878e6d1de1c5765d967c65df56b9f03c7b82ce68e3bd4745856d
font_02_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 16944 bytes
SHA-256: d8a7565f9904eefc711285b7c60f56897013ab7c387ae5c575298b129be1d396