Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcf978bb185637f…

MALICIOUS

PDF

58.3 KB Created: 2021-06-03 14:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f9bac49c71e49c0ec5940e80214e319 SHA-1: a46b7a75bc1dad6383511eb7934961454ec75202 SHA-256: 9fcf978bb185637fffbf7b2754abf475a261592aaa39cdb50f64e7c75d102806
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The file's structure and the presence of these links suggest it is used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9854

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/hqvs049ce1umkr1etd5qmag7k4/63939604932.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098645432e5e---95129415199.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2c02b1e5910da4392a008783be513d72/16792094123.pdf
    • http://learningkey.org/userfiles/23482326075.pdf
    • https://n-zvuk.ru/upload/file/terenudapuxetero.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d0a97f0f5---17460510154.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/25309755526.pdf
    • http://casier-a-bouteilles.com/file/39465269810.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cd4eeca6a76d9729dad04c0155080c6b/xafutetedop.pdf
    • http://chaitraglaze.com/uploads/14785055312.pdf
    • https://ka-base.no/images_content/file/wakizivapilajomorurajebav.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d3d8aa67f8fd88673871eeebe548dadf/kasedorav.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c08d1b1188e302d9677f30287321479a/49309960839.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513554a3d0---64302091815.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b822d8889c---beser.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/a04erfnkrfr01p8q83nbru4ibk/sodawarudepon.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd7ab6510---zorotebikam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=notas+para+flauta+cumbia+arabe
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d876.bin
9cd9314c6b2f5f2851814da36cb0b34fb1606a4b41779f92a6dc03f003336741		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 5268 bytes

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