Malicious PDF — malware analysis report

Static analysis result for SHA-256 8389e0b565098f09…

MALICIOUS

PDF

73.5 KB Created: 2021-07-13 03:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c59bf050e3c14019c7a9cc1c20f234d SHA-1: 865c88c62344ceb6dc9e7d8472f008a2d5d5ffde SHA-256: 8389e0b565098f092ecbb9ee011dcba27661cb6d79ff88ba30b9b073b1d95c82
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 embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious or phishing content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7403

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://infrive.ru/uplcv?utm_term=coffee+ground+on+plants PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/45c9056b8139e0571cfd2997f37784be/12188641603.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9l275t2n0dfpjbelgj4oel8r2m/82176924364.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a140d7df---mimuruxokosu.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/fikanilulirijakulugi.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/wabumunowupuxa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0f7348b6d---5546160548.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/kevigorubifasadejilu.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/hpgob4ebjunohm62u71hehshbj/55763253201.pdfIn PDF document text
    • https://atl-50.com/files/file/seveziwuvomepilaz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/netc248rq7nca9n2np97jbpt52/45698665173.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7728644023.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/28994536074.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/venozasigare.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/84748675502.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/zabopotiwexudukuvifasevi.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/wujiruxufina.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/miwoligiwefumabebo.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/7546138667.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/bidara.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/1952183767.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/fc96445a4914f975d12342ba312f0a0e/74860700619.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f6148d84935fec706839ee2f475c6889/5742515267.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e36f8a9f768---84267209501.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091554df07fa---xonotafolivelopezurep.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 10712 bytes
SHA-256: dd16223218f32e68a9860bb8ea0fb426df8246eb8c7649632dd3316186551336