Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bad2ad89a4b12c…

MALICIOUS

PDF

81.7 KB Created: 2021-08-17 08:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee1838237d3c0379c48d95a6c762fefa SHA-1: b849fa7bb23505914cf0aca0d47ecbf115f0dfc3 SHA-256: 97bad2ad89a4b12cdbe6e1a98032d87b5b31176a84f66885f6d6109505ff3da1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a phishing or malware payload, likely through a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5210

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 https://laborke.ru/uplcv?utm_term=it+all+adds+up+music+worksheet+answer+key PDF link annotation
    • https://unosms.us/userfiles/file/80805126344.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sfmvoe17vg6tnbt131t7d0b8r5/kosamefumilisavuraboreros.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f5fa9110---69451225412.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ca409239---wusubuzuwotavopuwimu.pdfIn PDF document text
    • http://www.celso.org/download/92253405211.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/narewi.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/39277595847.pdfIn PDF document text
    • http://e-sportis.com/images/upload/77437915373.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/16130484224.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/41347254497.pdfIn PDF document text
    • https://hoalavender.net/upload/files/laporigafegukus.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5ec42660776d36036cea36db43ee925d/muximizoxudi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mobojezekovijupudedobure.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kumoz.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/12523959058.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/89051812984.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/vosipazawolegobakogedime.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608afedb801b0---tuxebumik.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/87967284776.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e78a04c2---bilopar.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/efd8de7094727940984c400c64c0bac6/nazexamamawuzaxux.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0278d133---64872165297.pdfIn PDF document text
    • http://npas.ru/pic/file/5734901707.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/93110af985ba86c41ceca4ddbf933a5a/zawimojunatugawoti.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/58145946713.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/48ff45f03ccdb8a3c71a4e3813f900c7/9694298614.pdfIn PDF document text
    • https://bursac.net/userfiles/file/89070651203.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f3f848a9---megomujumopu.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_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 11120 bytes
SHA-256: 565af3776f5f443542291011fdfcc17ffa37aa951668cc4d9806871b61fd5a39
font_01_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1