Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6936a6f610ce3e…

MALICIOUS

PDF

156.8 KB Created: 2021-06-26 03:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d53c5adff4b2290ab29f5498f52a4e7 SHA-1: 33568fb0cf87156ee42ec4fdb7cabc6617a9ac2e SHA-256: dd6936a6f610ce3e6db3a5a1196b93ea71737ab318049793070904f2f00f2ae8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS upload directories. The heuristics indicate the PDF is designed to host a large number of links, likely to facilitate phishing or distribute further malware. No scripts were extracted, but the presence of multiple external URIs and the ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4574

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://crysiq.ru/uplcv?utm_term=seventh+greek+character PDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/aa98e2b2a23978e52b0b04562a6baec6/zorosuvoxikijabutelix.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/xapobevufutuvopedawuvubu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4464f9984bd0fee3e8c5e2387c489c44/43747150309.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/lumiriritodurezomow.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff2a4cc14---vatoxukepij.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae06c4842c---supowuluzigose.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oacjfjk42lato622nhm5gjp91n/xeniripadigoneb.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/fc5e797c0082ada472cdc3a0c6907f0b/18127420294.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/ritoxa.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/tizisawefo.pdfIn PDF document text
    • http://jarosi.hu/files/file/56795372527.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ec3e5351---sunix.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089e786d2fda---luzogelutolidulumesof.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c29615ba5638939f1651ed7a31cac787/damolemuvomujomebapo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c7ef445c6f502f62c2ebda194eb93f3c/wegejezodomixalurezav.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3813ab7c57---46107713677.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a7311c0d---bugijekujovigidelugezoxux.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765edc127a9---91823635695.pdfIn PDF document text
    • http://charivne.info/images/file/33887002007.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8b14b435---xogagekokajazowom.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pih13a5su8fcnvh8kjebpcl2e8/wibapewidir.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB24 18224 bytes
SHA-256: 9c4d0e306c5cd01a238a70b025b2851338f4302766a9f0a646ececce1d904e62
font_01_sfnt_off0001e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20064 10316 bytes
SHA-256: dc2660a7770c5eeebca3c3b5ed14b061435f8c4cf54fcb054711bcb2767f8c73