Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d56b855fbda4c4a…

MALICIOUS

PDF

75.1 KB Created: 2021-08-30 21:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95252dde746b8f54d71856a735d4a37c SHA-1: ab2107ba7d90bdf826a68660b2e85360ae620fbe SHA-256: 6d56b855fbda4c4a4e73380a4f638b26c9580f51841764c69e28e746d582fd98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to obscure the true destination. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7452

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://coretry.ru/uplcv?utm_term=xray+texture+pack+1.8+download PDF link annotation
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e417c389686---27399040323.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd25aa0fd0e---kagaw.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c4q5en5bv0rhpdqkip7dogh4g6/30261575673.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/84608715460.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/91507358801.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/waselolofive.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc8192d3b---53813414407.pdfIn PDF document text
    • http://altinay-law.com/images/file/73955261613.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/89675307692.pdfIn PDF document text
    • https://autoskola-scp.com/files/latokutufubumabagujaliz.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kofawedikebafivubirojogo.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/36715697091.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779072b8cf1---900143378.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/51rch5m0r5kr8n87892tri4ma3/78356385648.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16094db0fe8b62---97075710877.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/87512288945.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/nipelitekexusanev.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/56465168283.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/60992239489.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/sexoluxakoxolevuwi.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/zufozobijebanurajixi.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/16346214256.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/pisedikod.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/tigakubedojowometagaf.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_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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