Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56b76ca76fc3f33…

MALICIOUS

PDF

81.1 KB Created: 2021-08-10 06:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 042f506ec9ce41e2a4e101770028cb66 SHA-1: 10f647680ba365b70eb7d1ea6173e17fe5852b2b SHA-256: e56b76ca76fc3f335234ddc76cacf6c0661d09c97d0f17d5da7d9d8d23528f7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 malicious score 0.9244

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 http://mitra.su/uploads/ckeditor/files/gobidatumiruvumigefixu.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/09c5c8072d5537f23f94d3500d06334b/xotop.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/lodejapilasisoxibutuxagur.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/99606010654.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lobatafud.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bc68d43ea94---66228107590.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afce5f6f196---fojapanedupebuwimapozule.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/47357779721.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c590861fb96---95522313732.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3tidrgbaa9b6jnpbn5ebl15bub/162775814.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/afdb9ad3a863e95236da3895926674d0/nisoxonodotogasesowibula.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/69735420978.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807dfc2d6b2---bitimeb.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/39749713151.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210723004712_1178101616.pdfIn PDF document text
    • http://quetthe.com/upload/files/kopalebelotabid.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/462c62gbog3aajkjchm1a19738/55197315665.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/rizokigifepibifezosima.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/59c597d1653c79c1729f4bbd00119698/58201572281.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db700a0485---62472294800.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080a8ca53ca8---86433317043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+vernier+caliper+gaugePDF 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_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 10792 bytes
SHA-256: b0db54f7566fd36fcc8447c867c7d5e6fbb2205c3f3826ba4bb7387ac1d83f7b
font_01_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 18192 bytes
SHA-256: c96713882d37b191ef3be1d6bbc9b638608757ef3435508bcbd156aa7a299fcc

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