Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3de5002e762007…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 07:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5ed459419801c45ac934637c61fa25d SHA-1: 147af83405d0d5546e6e9b3fb9d60b86a760d53b SHA-256: fc3de5002e762007fd308559e5905933dd24b41e0871ee8cb8cdfd381e089009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://promise-land.com/upload/file/46454747621.pdf In PDF document text
    • https://cncostruzioni.com/userfiles/file/zavaruron.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8c4cc826f74fa78b354694d3d66ad779/37982607858.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210731022720.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/juxanogufazepitenado.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/maxubapesurarax.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3884d8914---36370628138.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9usrbf8ean3e6fupqqcahq4r1h/42911624972.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kedatafumalowurujale.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160747a9b9e784---kefafoxuxujakina.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/89843813669.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f629c2f2---kusazo.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/mugutiwipekopipejakosate.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16298698721721369209.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/4068860546.pdfIn PDF document text
    • http://indecomavo.pl/inc/likajov.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a804900afe17f43a0c84ba9f611c4835/66563527909.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ffer52c5vjdb9uns9bkpoh5md4/14068764937.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/832868deb9d74f2c45ce01df5de9a2e2/6911835877.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/zepuxikaresoxilek.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/81362519918.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/mijevojafevotolukut.pdfIn PDF document text
    • https://nada70.org/userfiles/file/zatatetojuvemaguwigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ragtime+full+book+pdfPDF link annotation
    • 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://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
font_00_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 18248 bytes
SHA-256: 4cdce5b771fcd080879f9bb026b01bb8ed9d30f6744737bb98da8ee9dd141a71
font_01_sfnt_off0001297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 10844 bytes
SHA-256: b6410379bd4a29b367c0df961d578b750f2eccaefef9341d0f2a04c171fcb723
font_02_sfnt_off00014221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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