Malicious PDF — malware analysis report

Static analysis result for SHA-256 effef688c279e0f6…

MALICIOUS

PDF

69.5 KB Created: 2021-06-09 10:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8f2f63bd507e1694ad5910cf3d8f7a8b SHA-1: ac2c49d1ab23fdcfbecb6f17e093aed9be0689d9 SHA-256: effef688c279e0f63f5460bb454b6852d8fe17be8b971ad58f7b0412f973ce6e
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a piano theme, likely a lure to disguise its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8149

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://crewmak.ru/uplcv?utm_term=the+sound+of+silence+disturbed+piano+pdf PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077297595ed0---73843655587.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e5fe3f7560769c9092c00200a42528be/46147225855.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9d156cd004eff8109e2fa4d4e640702e/burevolobikasusubizub.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052306374577.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/72bb5fc2dfd11b7f68096051a6f2d6a6/96801032889.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kvagekkmh1da1bgsndeme299t1/74030712402.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/b03b54444e9bd4a27721ca786704b732/poxewu.pdfIn PDF document text
    • http://4bx.pl/public/file/52379712853.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/12262326003.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/foruxenuturafuxajevalelok.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/pifekinulifobaxowejosove.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/34264836688.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bd957132d61---15345901156.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 5332 bytes
SHA-256: e09b9fdd10c222e093b117e1a4130923233193d4017286fac6c7a3f7d3232d7b

Open this report in the interactive analyzer, or submit your own file for analysis.