Malicious PDF — malware analysis report

Static analysis result for SHA-256 6609a247ff4c4a1b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 14:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6caf8de1ee52b31d8d951b9696b670e SHA-1: 9c6fd154863f7e1ece692e30b40d95b099a53e91 SHA-256: 6609a247ff4c4a1b3879ad9e01f046aa8e4c4ce6e8a72618e0418878907b259b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV with the signature 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the presence of multiple external links and the ClamAV detection strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.1831

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://cructi.ru/uplcv?utm_term=sullair+185+portable+air+compressor+manual PDF link annotation
    • http://bjsixiang.com/jingkelun/userfiles/files/20210803153112.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/76637472607.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/lemit.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/34720810149.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tjksl1oshs9h72fide24jv2drf/rakiwale.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16297679871292942265.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/1843514882.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6c3c69c98---digokatevonilijidisugevof.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/4741658396.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/95bf81f7cba03ce6176cbe92deeceab0/6261995982.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/5380647676.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16099faa5c0377---36655046373.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/rifisupirisojas.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6ba04bbcb41927f7b53408ab29171f27/malikagenabejiromov.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b68c2a19b---zazavabepoguwif.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/65499723931.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5313306d8e4411e7da97ba8538c74975/banadunovidefuzepiketaze.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/52820537953.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/tevamusatobujeresasopis.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/xapezipururemuduzuni.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/pizodamiguzujos.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/dusozifojefebejexa.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/96520965f80dd186c7488dea5eec771a/zifenu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e2188897643eb90e88cdae6dc4712970/gurevapawijov.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/36496741091.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4092d3488eef1f28287a2a35bfd9998c/4296824821.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_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 11244 bytes
SHA-256: fb152622c7a963c40baa5ed28847d9f7024284025df312514e571cd42f59dd98
font_01_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1