Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5032c601b61a17b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 07:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20c781a8b2b93b72a2f904b3e5dd6a5d SHA-1: 21a5ce317716a99ae52592518b45d4e8340a0ec1 SHA-256: a5032c601b61a17b2cff04436c5c5d252ae3ef3ef0d6efd6a3d49cf288447f0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely to redirect users to malicious content. No scripts were extracted from this sample, but the PDF structure itself is designed to host and distribute these malicious links.

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://dakhoathienhoa.net/images/files/99328239297.pdf In PDF document text
    • http://tele-video.ru/upload/files/nejijotokigevulowegadel.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/kasorej.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/fodabijapokukapifunozomas.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeceeb9820---98474960616.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611190038b8bd---baduwuberuberudoj.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/sefejogip.pdfIn PDF document text
    • https://priscar.com/documents/files/27934867723.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f04664261---9127945120.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/doxefajipa.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qvgc1rd1uho97f2a57hr5km0s9/kifaru.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/67f225163ff4bb2fdda6e14c1ff62c96/76361088419.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1e1e8f3f---14588335508.pdfIn PDF document text
    • http://mcutech.net/files/nogewopipatowixilifup.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4468063613986434ba657af16b99de4f/31151469595.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb87f8cf868---50646081654.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/53484668291.pdfIn PDF document text
    • https://citytrafik.nu/images/file/33117826580.pdfIn PDF document text
    • http://saimiri.name/upload/file/36076735267.pdfIn PDF document text
    • https://foulardfotografando.it/file/nemiwudurivatodozeza.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/31056951958.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ejat8tmiaaapj9pd0hdncgenh0/61423102541.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70d02e672---71840489494.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/7139631417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=krups+nespresso+manualPDF 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_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 10312 bytes
SHA-256: 55d41380cbb0cfcbc1489d5f0e3e1109f3d36e98982b71a9303b6172b33e787b
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 19912 bytes
SHA-256: 1e1e5a832f5f98bb739116553895c1122f2e58ec1c05b40879230387ab2d674e
font_02_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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