Malicious PDF — malware analysis report

Static analysis result for SHA-256 0381b6f8c111c7d6…

MALICIOUS

PDF

103.7 KB Created: 2021-06-13 15:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c3023b03556e21264382dc88343533bc SHA-1: c98d14f86e48a790d5457e7e628f9d5f15c2ef83 SHA-256: 0381b6f8c111c7d68e2b8b310b841d15c74bdc773501b8b69575acaf0be0779b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains keywords related to free movie downloads, indicating a lure for users to click on the embedded links. No scripts were extracted, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://nomylo.ru/uplcv?utm_term=barbie+swan+lake+full+movie+free PDF link annotation
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/najotakiwesitanizew.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bazarunurebozo.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/99650935600.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/84821072898.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070efbb88464---kaxiwov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfebc35ff8b---xovogosuler.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6df603b3c---73663328661.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/37747788eb4777bac18708db433fd1f1/bixorepejetisapamutu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b135038bc18---22792310318.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/82d976b59f2e7438d358f4a81a8b5f38/gafuditijewal.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21a1980da---koturadata.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0687341c08---91781021975.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bf221234b822273d0fce5423b1c24fc4/muxig.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/27181226063.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/xetapijozufofojefosodal.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaafd6bf540---29160779529.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6tksq0grrg5vnjt9690uq9gk7f/35189889419.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00017318.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17318 18204 bytes
SHA-256: 4985ea7c3917c73725fca34c63db955c3c6408e549d23c7e8d6f09293be9615c
font_00_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 5776 bytes
SHA-256: 0fbd1de98129e7772a4aea0d710a945c0afd2396060add5601e2cf56b5d25221
font_01_sfnt_off00011669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 5320 bytes
SHA-256: 3efe03aa241fba69b16164f69a4eab3859b3de98df2d425d388d471f2f5cebf8
font_02_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 8964 bytes
SHA-256: 39962d109d5012912f9fea43acb6e4b9b26183965f0223ea12c55731eca0c84c
font_03_sfnt_off00014186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14186 16204 bytes
SHA-256: c9de2e17a28aaa0bb0d933d49e54907916897e9f470fb25903904450ad503103

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