Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbe26b693f701d0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 02:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8094627d70638f44dc379943bdc1819 SHA-1: 40e78fb60f2c10ba13723aed110e16394b2b7e5d SHA-256: 6bbe26b693f701d06bd68c651dbc91eadac0a6e3a61e2f6e663ea8dd253efc0f
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6878

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=line+chart+examples PDF link annotation
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/82a59097d0db71718795d48e9b1d5e9b/milinizim.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/943f8ca1b12bf5c4a0fd428697907658/fowewamaponoreg.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/risuwewukax.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/29654522875.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607634e86558c---1319949911.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/fd74d11b32505f9430fc2561bdd72632/vovomemufosugafekomoga.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/81798479745.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb0e27268---6353454661.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/11733932474.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/21718975770.pdfIn PDF document text
    • http://wamer.org/userfiles/file/76280437501.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/52127527852.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/15382990113.pdfIn PDF document text
    • http://azizolace.cz/images/file/39880412562.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbf80b61b---10198893818.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/35396168299.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/85029384003.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e52c157bc.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/pifixabijirul.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/123ea583aa5244b0ee07327d0e682234/sowosofovikozofewafo.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/bonunu.pdfIn PDF document text
    • 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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 17928 bytes
SHA-256: a7f0eefaf1e08dc6b5a02afb43ceef7a9c9caebcda59da4c59ffdd540049cf8e
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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