Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f63cc299a3b7c00…

MALICIOUS

PDF

144.7 KB Created: 2021-06-09 04:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7575f311d8cd007e7ec1509aff7969b9 SHA-1: d7b9d59aa4548a44613c2c85c31f66d40fa54ad7 SHA-256: 3f63cc299a3b7c00ee44b93d5d5aefe8c5bb6035da9f6ba83daeea69f992a7ae
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely serving as a distribution point for phishing or malware. The heuristic firings suggest the PDF is designed to leverage compromised CMS upload storage and disposable hosting for its malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ketchas.ru/uplcv?utm_term=eswari+bakthi+padal PDF link annotation
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e08c4acb37fec2e77337b34c64ece9f/46978827089.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/lawukevutiwexavalisexi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2d00e6751---39957070137.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608708739f671---woxas.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/xagejixularibuxezi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608736340dc01---32743827227.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/73059275790.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0ke7j9t7t0nqkq6vu8qbp4nk2v/kixilorizabizim.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/noxujosupifaza.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd6debc64---pawinotijuz.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9f9c2eea---43141334780.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/05db9b7b80fc5a466a53991f587f29db/45570053737.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/joronapemesijebodemiza.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56518652a---vutakakibafapezufitexo.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/565d5942e729a98073384a47f7fcc7b5/bitesigusimiwawilir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20069 5300 bytes
SHA-256: eefd11e35a7493eeb4c299d4dc525baa694efb983b5c346f6fc006e5dc27b95f
font_01_sfnt_off0002127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2127A 10804 bytes
SHA-256: d3d8dca42bb9ee8d30c6d5df243eccb05e3d6c14de1ab76289a0be608431fff7