Malicious PDF — malware analysis report

Static analysis result for SHA-256 be39821be5fae573…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 18:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce2bd09642c140eeddd84cb484e05cdf SHA-1: 6ae7d15e8b5df1ef5c7c91c62e62baaf31936262 SHA-256: be39821be5fae573b1819dd1064665d58c7f60e411dedb47bcc1c12558ab1d64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8889

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80d127f3e---gugujeledoxudarejonu.pdf In PDF document text
    • http://agama-rc.com/upload/files/bazaw.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f4n50sgh4o9uqjur0revqd1t55/pilalalutawexir.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/21786371746.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/87659639314.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf473a723---23902173716.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/tunubuziwufapexafegepe.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/kowabowano.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161042e26100c9---56383120955.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/lasogulobila.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/np24423lvh6j2ftbjrfabep9v4/givibikidevesobakitegire.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae58825cf9e---xofot.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3719cc91d1---subolivexiso.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d723a2046188bebbbb393cdd6097eca5/gobulesufef.pdfIn PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/46917847285.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/zujoremirodorolagu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/53587756630.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/9914487425.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/77463689165.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28cf7534eb---61150191565.pdfIn PDF document text
    • http://health-bridge.in/upload/file/duxumalikupejivadej.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/72dis7s9hv8k5n1ctqk8v2l9h4/korexofedum.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb380cd85---66900739996.pdfIn PDF document text
    • http://effekt-film.de/files/file/loxomibomopanuvokusugoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=approximation+pdf+for+sbi+clerk+2019PDF link annotation
    • 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_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 11560 bytes
SHA-256: a80bdbc5fd4b356945f4c150ebe8d4c58643bf32c17d67b10e5d5abbb5df5c5c
font_02_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4