Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6b4dfc686701d6…

MALICIOUS

PDF

105.0 KB Created: 2021-07-01 14:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 46af06c11b3d31cbd310b5d101cb5f0c SHA-1: f2f34c0e20958342cf2d709e30a22d7081320def SHA-256: 4a6b4dfc686701d66dd157d6dd187318ed95ac6d80d976eb8a1e5c6ce18365e9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3296

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://coretry.ru/uplcv?utm_term=merely+in+arabic PDF link annotation
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af77e7430f7---36192167126.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd82164fd6---xakavagizefabixizixav.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/tiwanuvulubevi.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/84180500869.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76546121713.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4ncju8gmdptvar0bat1gfp02ts/gulemaxuzojepixafadolu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/32faf2800c9583f4b1f23e528d398ab8/6103106597.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baacd177746---tesevirunoxukukukore.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/84149520508.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607144cb05c4f---zeluzazujagedos.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/neberivibisisigidiv.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f015d8b78e30de06329e8a51ff55cd00/kezaresovude.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/wupovir.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ef85ce48d56676364169d3bd0c54fdbe/xekotezidum.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0cec7054e5a759f269e257793d58422f/loputameroseva.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/dacc4373e248d206cbfd147d2f6b1bd5/26952844724.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607150379acc2---veluzij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65671479e9---kamikupufilexukekefamodu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ab9a0357e8115d97ab80e21285316d04/8524923065.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba20507c8e1---87113582120.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2af7facfb52e70403b0c2280eec54d34/87492004902.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fbcbb2e6eb22d01f5d5274a1e01c59e6/kiponagudasaronowetul.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a6f9b900d---zupuvaradazimo.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/567721115c9770afe6215095d92f5109/wufurukedelelibi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92a23db3f---fomofotanikimurasexurewug.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/898f94cfa7ed99238b6f2870a26a1d3c/joxivemoxojolibidigul.pdfIn PDF document text
    • 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
stream_002_off0001245e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1245E 33928 bytes
SHA-256: 146c361748321690c350344d1cb0c2e7813b36d98d8009ccc34b7f6e0cda2269
font_01_sfnt_off000160be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160BE 16140 bytes
SHA-256: 9f6cac9833c18c72a36533fd5d190b047629c056ec7a1ab8d656fc5abdaebd75
font_02_sfnt_off000189d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189D7 10084 bytes
SHA-256: e5d730dd5b30dae7a7c89b65165dcf0ae908ab6df38539f18f9d5e5ea6e9ccd1

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