Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37f152660163c97…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 07:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00ecf144a105c8cd4a6374ac391e55a1 SHA-1: fdbcdd1cfe89c4139146f18e5628392d6f840a07 SHA-256: a37f152660163c97debeee7fd1299cda6425eef3131c4617deb5c7adc9507caa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm characteristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607246d669f8f---xipebavanadejonaxi.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7503f5a0fece98222758e1863c9d64cf/90917706289.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jexomitagunobama.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/32491941981.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f6e624a4---bigidovizabonuvekaden.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/83546568506.pdfIn PDF document text
    • https://soechi.net/userfiles/file/45525496780.pdfIn PDF document text
    • http://dsraxys.com/uploads/kowisikerufafej.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/vejinunusevos.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/beforodotujasegako.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/88640816899.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/94446140721.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/05878815b52240127822515e52cfb7f3/40765845884.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf363f87fdd---76435728232.pdfIn PDF document text
    • https://serka.com/serka/upload/files/187454325.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df310254a---88698386102.pdfIn PDF document text
    • http://twilaw.com/files/files/79544919620.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/38022949856.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/75413438575.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/10300751174.pdfIn PDF document text
    • https://tcremich.lu/files/files/pijopinofam.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/37095195304.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f763d174---bezeponajamokipuk.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/23835506808.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/78757999444.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/65421819053.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52f98e078e---23766150837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ielts+band+calculator+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_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 16404 bytes
SHA-256: 56874536cf56015a28a2542c1d2b18bf1cd23485cea65ed74a02a12106f3fd90
font_01_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13179 10712 bytes
SHA-256: 4ba869eb4025651423209886313376b4beabeb85b9a06c5ba04945e01f2d1a37

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