Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d42c3b867a02beb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 10:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f72660ea58fbfe8d0725043407d837f3 SHA-1: 7b657b85309104e97e7c039347bbfc05278de07b SHA-256: 5d42c3b867a02beb34a0b4cb0577671d0aca67dbeb3e26747aa5d38ad2f6dce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=converting+pdf+into+word+file+online PDF link annotation
    • http://isvpro.com/custom/files/32452099627.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/48078455580.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fgagie1jtjvulpjpocvrrcoihj/69296774345.pdfIn PDF document text
    • https://limadelimon.com/images/file/deripuligodetevuzojur.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/wumalavaj.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/9797675008.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f5a220cb4---lubopimozonuziziwas.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1572e6af---90531234149.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ff3345490f0024e8e8a41e20e393bc3e/85441141051.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc065b4454d---sumaruvowofaxegudibizu.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/52283510349.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/58809908348.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/42220532723.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3457_20210704070704.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/22702089172.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/gememigamekixiru.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/85670923305.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/52345858979.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610890ec751d5---kokoko.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/mobobewapowuvijafipoma.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9851508233.pdfIn PDF document text
    • https://tavio.ru/files/file/31745496352.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281047433917.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/60377678812.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 17040 bytes
SHA-256: 56cd38dce6d0c839ee14ac324b06aa686fe112718c6b89b608358c0eecc35cc1
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 10528 bytes
SHA-256: 8d0642d67a3a63ef9eed6fde4bc47d3b387e77188d315daa47366d519482d443
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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