Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed16d2309aabb08…

MALICIOUS

PDF

67.8 KB Created: 2021-09-13 22:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3e1d8a6764966acb3cf42d5c520c618 SHA-1: fedd0da3a8a4441acf7700ab8fd807f9eeaf216a SHA-256: 6ed16d2309aabb0819871a2f840f3d69e433580cf435f23326802efc70b1bed3
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous links suggests an attempt to lure users to external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8854

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 http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50802fe51---fekozeguwo.pdf In PDF document text
    • http://dolphinkorea.com/files/files/mukedonifavexezererakut.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613857b1c8056---6260867233.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a124ijoevdvjanfdcnl0fm3vb5/kujakin.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/zabinekemegokuwikasa.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/lovokerosebiribadojowum.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/wevoxepaxiwe.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/farilivipigamevi.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/febutifedatabowewa.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/mororoxuvobexubulifov.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/resemiropemufegekux.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/fagonurubiso.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/4647610408.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4605e7584---vajogujibedema.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/41772374036.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/kixesizemubebasowodonerun.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210910_F263CD2402A4025C.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/lofunaw.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/temiwemuk.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0d20c78d---90978023786.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/jigijuvijojudasa.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/kunetovodojewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+other+files+taking+up+spacePDF link annotation
    • 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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 17452 bytes
SHA-256: 8ba3c23ff03ffacd17051c484a26952ce5dc0e5c4bbb8d22a6bdb5ab78fe069d
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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