Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b41cc344335b2db…

MALICIOUS

PDF

71.9 KB Created: 2021-07-06 08:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1a1392d70cdb03b33eb3c64a4a879219 SHA-1: dab631639edefaef32457e808ce510e7937f62dd SHA-256: 8b41cc344335b2db30f1c742497a7a6d42c1d243b784c9bedd23d9e0ed9cf984
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://huntic.ru/uplcv?utm_term=financial+analysis+of+financial+statements PDF link annotation
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f85111b2e---16934071870.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0r35kjbf6jn61rgbuijo5kemg1/wojitabofusevinoxadi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073fd3cf388c---wabujixijebuvopi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/45502299525.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/81d8540dfe95ad246ad0ca6cdf2e1d66/96751071395.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/026a0564f54496299b2a7e1449792b85/luwewilutawak.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a934ed66a5---ketewofikudilamuna.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/bulisolidetiboled.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b5decbba---63600149302.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e201b6d6---pojexukufijelolirada.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/18321932359.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/46662922383.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/86d71da3368045e651b2f1bdde9fc935/94752056470.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/zipefujezepoboligufabenun.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da63d081e52---44719600530.pdfIn PDF document text
    • https://menu2uplus.com/images/file/87939213723.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17b165ff65---zameweruxibavepedegija.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/zixilutiwoguk.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9fdeb793bf79451819e86746d49ae629/56344481364.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7ac37ccb5---62312742530.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0ba031b66bca1c610e249bbb1f36643a/wugonimejazaf.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/89785756841.pdfIn PDF document text
    • http://iwishop.hu/file/marigozotop.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/19207994815.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2213f030---purekewolapetagezofadav.pdfIn PDF document text
    • 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_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 10488 bytes
SHA-256: 7266adc239433d421c95dcf51187f713c2f684c48b761cd8ba9294506e6db15a