Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc94feb32220bad7…

MALICIOUS

PDF

63.6 KB Created: 2021-09-03 21:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cff5df8d49541f8dca5e06b1da57744 SHA-1: 6123562ec9a6794a330a883a0662d4e5ed2a196e SHA-256: fc94feb32220bad792e6f3b6951b49a8d3e314f2fe546fda77b67eb8b83e7c96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, potentially as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7100

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://crewmak.ru/uplcv?utm_term=physics+olympiad+books+pdf+download PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/imfr29imiats7d1qcsi69gqsv1/88623056255.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/fowukumojugolisake.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/xewutupu.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/manik.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/tujasodafulatago.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9316a50e329ebdbc08b4592a140768e9/wabuxokatatoritowogef.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131bac241029---6004444574.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/vesukatetuxutovozanato.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6sil7a9tnqi6rk0e6ib8qav9dt/80799475909.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44399fdbc---24466442798.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b2732d493---turigejoto.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/53839805505.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf30841d0---41349606555.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1a8a06d0---jukemizomabixavabimasube.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/firusifapuvakevisobadore.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061003191783.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/30719813608.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078d185e1142---75842452710.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e8218be2d81b0e672d80926bae07702c/kelubova.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6576bce81---6486022467.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wusalibamijeguvun.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/28381085497.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ac86750e99817918d9118bed651d669b/situnititakevabibijonon.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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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