Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed16a589b099bb13…

MALICIOUS

PDF

71.7 KB Created: 2021-08-17 19:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: feb734c041b0ec36c0147be1b53823fc SHA-1: b803ee4b1d701e34d391f49805b8c5127d9a41f3 SHA-256: ed16a589b099bb13d1171735d09bf4699a0e903fe80eca07a56f8129e4daa25a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample, but the structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5411

Heuristics 5

  • 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
  • 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://asbazainville.org/userfiles/file/86404483551.pdf In PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e954aee37---84468519488.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/91723612530.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/favixidepupodebus.pdfIn PDF document text
    • http://hibertek.com/image/files/20210629_083135.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2133c22661---5384422863.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/71ffe8e39c5e533dacec8ebbba71c92e/46753441575.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0374a22d2f---voruxijikuxewafufofaz.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105280702192281.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf9fa6217---30179673754.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zafudejuvogumobugiligiwe.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a63c2dd13---90330346894.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/utqps0jjudvvmg4mk733hmuu7f/dofoxis.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e04d3ea2af9e7fa0a381d79499d18c0b/5949420153.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/904840133.pdfIn PDF document text
    • http://master-br.ru/img/file/44723748059.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731133d3cd2---29187912230.pdfIn PDF document text
    • http://skomi.ru/img/files/file/vajoduxafedixip.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/45414751697.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/gtch943b0hvsipvqijvisb35li/46698182883.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/32377992285.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/56762314fcb19408adc1102f8922a13d/wokamukavopu.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/15224079877.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608717f6134a5---vukatup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=add+pokecord+bot+to+discordPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 16396 bytes
SHA-256: 318bfac56918f059623290e27d7f705af2f3b4346c1d30ae8f8c8052817d2ce1
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 18176 bytes
SHA-256: 92c8d9abab0954c95edd018aa62fe6c6fc8d8d51f4df587f53a45013a60cb684