Malicious PDF — malware analysis report

Static analysis result for SHA-256 a567726825f9846d…

MALICIOUS

PDF

96.0 KB Created: 2021-07-03 15:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90cebeac0bd958a108d5b5459368c140 SHA-1: a891d986f4b5eb6ccad02d840deaff8b8db6b8a6 SHA-256: a567726825f9846d3b3d359cc51a43675ee3959563270de7f59800c0a122a144
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, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to facilitate phishing or malware distribution, likely through spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7314

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://medvor.ru/uplcv?utm_term=overuse+of+groundwater+can+lead+to PDF link annotation
    • http://rollfactorytogo.com/uploads/files/12177327252.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ccf3ae9d7---kifafewivumadarepuraxemu.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/b0vrbgc9iu15ho1afq42sheh0g/xukebirom.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/04af1bfc57335bcce323ccc3f25adf1d/kobowilosepaxifejax.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/jtdnfbfnk5jk968vf38s7p69v6/96424351559.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3690b7f9---nekoposeribine.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada69e632e6---68867960567.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5973c406b7---60584625155.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a504aeb06---gusiforemeweduzonilifab.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/p8kil5s95lec6hdvpp9gu2u331/dulakin.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/07fc70be381410a938d2d42d2df51a93/zareka.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3bf0c408e---zupigiwizogozekarorup.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/severupaxe.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/31673858446.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5efsc92c6gd8kvmrpkhunjg5q1/12009989221.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d88c77e31---zotovimulobe.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/99535539086.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/lerobes.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092395bebe22---xokaxedebugadevekodamik.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837240f1873---gigiwapufiwuvuf.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094e41c1f68a---memubupufigibupeveso.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c7125f744d3c4155f9e332773977579/74404075859.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_off00014698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14698 10836 bytes
SHA-256: 66f33f40c88744e6f1cb92289277fa381a471964ac96c0f89f8d774d79b2b397