Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8a08e2f693509a…

MALICIOUS

PDF

101.5 KB Created: 2021-07-15 16:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dfc97771f57290588d8c634ab94242f SHA-1: b85c2bd20214108ee6cd97fb9b944f1e73006893 SHA-256: 9e8a08e2f693509a293d116ead778681ee3a7120398bad7b4890abf847fe5429
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', further indicating malicious intent. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4758

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.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ef70faf4---fofigeliwubudubexo.pdf In PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/dujimemo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723a2beba42---42170769361.pdfIn PDF document text
    • http://headrepublic.pl/images/files/338145158.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/wajosezonom.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a10239be86d---juzefebu.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/73592925597.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607256a05fb20---41627986890.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab41daceb14---37925600408.pdfIn PDF document text
    • http://usmleworkout.com/files/file/46953213928.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/zopuvebuvikipu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa40063c57---45683011930.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c6be457fb---44023269457.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/guvac7prmgc38e2nlpbnivge2j/fageju.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc91bc793b---jiduxegunipujonu.pdfIn PDF document text
    • http://www.bandungmesin.com/file/jasorejuwosolune.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/37649582409.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/8851112893.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/37296708476.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/69859798856.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a30ed8ed8c9d3cc2e956808a5b390233/tijatakibepasomipodur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=christmas+songs+and+chordsPDF 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_off00014107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14107 10668 bytes
SHA-256: 9c5fba6adfb5b3bfb4f91fb6ccb9fab8c69914d4b783bafa5929a00ac3c5a538
font_01_sfnt_off00015918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15918 17148 bytes
SHA-256: 58d1d7f0125fb3d93507098875770d3d4101e96dea4c867520b313f77c278968

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