Malicious PDF — malware analysis report

Static analysis result for SHA-256 25db6ea610872d2b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 10:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97c7cb647c4ea87b586e67212a1d2f3f SHA-1: a64607ed1b1f6221b6f46ab3b810fbaecbc9cb0b SHA-256: 25db6ea610872d2b10ca06bf840e3d220ac613e10a49bc09ca518dd83f9ee3ef
154 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to external sites. Several URLs point to compromised CMS upload directories, suggesting a potential distribution point for malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9162

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 http://brilspa.ro/userfiles/file///23904875644.pdf In PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/77621512571.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef0d05129---84738965362.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/lenajavuxaxivulap.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/58394502823.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/37022391452.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8ed84ad3---38822521205.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/doleratek.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b707cc557d0---lijuwazupu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/nltcbj934k0bubv5mpdm43hs25/neduxibididusizobane.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/rarilonobogorinezopi.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/95333397647.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9be6e5df---7407823896.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/1ikmh7f59u92jathgdpt3hcogg/60234998349.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/06fda4a187379c5d0a1c5c6e4a305f7b/28639103310.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ed44ebb0---sileginuvisujolukawuf.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/129bd01461fe925faed3d87945a552fa/6194682059.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/wigobepokejowax.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609534407237a---sovozixilarozejosowejeva.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e17c4f38---jonebavodidov.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/82645703117.pdfIn PDF document text
    • http://sdes.in/uploads/marolepuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=important+trees+of+evergreen+forestPDF link annotation
    • 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_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10580 bytes
SHA-256: 5e8a7ee7e41511f43194e683b550666b7988d38d0a5d35de351492e18ac8de53

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