Malicious PDF — malware analysis report

Static analysis result for SHA-256 633382ac0a324224…

MALICIOUS

PDF

72.0 KB Created: 2021-06-16 02:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bb6fa5fd857a62008059fabb1709ad6c SHA-1: 16f4d6f2e7087edaddc48229f1bc3bf99367e171 SHA-256: 633382ac0a32422459440cffbfd1ad928e2f65b4a3975c93311c4c72c0552a95
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.6516

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://pistant.ru/uplcv?utm_term=country+can+survive+lyrics PDF link annotation
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9vd1fsf1le8f86t0eupa7u84du/voraxulubemu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a230de433---49737516767.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4b803eb30cb45dcfc83ccf9b62cedd79/6742193343.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/10679734124.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb4098d8b---73618873068.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zafuzifug.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d11ef2e1---risonusa.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/negage.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944861eff0a---24033923743.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/4211985241.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/16851784505.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1b11e11dbb7bb69e37d61aa125ec2380/titifubafewebe.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/dcd656fbe9824213bb2a74c38c008ae8/3326987847.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74765cee542ac5fcadddd3df60dac650/61495421208.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/64200330738.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 4032 bytes
SHA-256: 1dac03cc6c6c4c9fa3e0bb3cf1406dcffd4737a3c0f0e4283691b08f98668401
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 4860 bytes
SHA-256: 701bd7735b0b7a33fd7964c0225885e004a5ba8e64d7714126b8ffea51d8ceff
font_02_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 12080 bytes
SHA-256: 96365adaa20a7d2e8a8e656e88f7bd041c0061cf8b195599f1129b9ea46daccd

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