Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd992ead468f3d52…

MALICIOUS

PDF

93.1 KB Created: 2021-09-12 21:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 935dc094f35d8a3a66541cb10e4eb373 SHA-1: b7fa1b68cd930393db4c2092f0c378421f6b4912 SHA-256: fd992ead468f3d526757459b178c03a1f69a3b27d0e26297a0d3655570c6ce81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/fekuzujetibesefunibas.pdf In PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109101417413382.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/83275063830.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/kaneguxupereweka.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/bojejagamewugili.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/75966708366.pdfIn PDF document text
    • http://proart.by/media/file/29858820079.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2f07e6aa4---23796800432.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/wizegolo.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/70842126121.pdfIn PDF document text
    • https://blokhol.com/upload/files/tepotebidimedavalulibara.pdfIn PDF document text
    • https://titishop.co/upload/files/muvevil.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/gulek.pdfIn PDF document text
    • http://seamacros.com/upload/file/jilasapadopovalolovexizi.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/14105951833.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/93929707898.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161386710b1182---91830656177.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/bagowuxina.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/nuzigesanenoxilugifodogub.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161372d6840fb4---juwopizuxeramurudeseko.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/45579991495.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/3272408415.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210906_163618.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/1078159028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+whatsapp+notification+soundPDF 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_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 19384 bytes
SHA-256: 03c46e8ea4ab41d8be6132b50abbddfbb68cb14782b63638ad769d9f1b08728c
font_01_sfnt_off0001367c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367C 10704 bytes
SHA-256: 5f2a3a9f21505441b4a5991b899f889cb1b416b5126ca93b158ee9406b394a6f
font_02_sfnt_off00014f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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