Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc42ba1d50682cc4…

MALICIOUS

PDF

55.4 KB Created: 2021-09-17 09:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c33086f26e02ebf04f8253d962fc933b SHA-1: f7e974fd6fe1de90941f437370077bd37e32ef7b SHA-256: fc42ba1d50682cc475bfd16882ae08b94f1ebbed67675f4cae6a942888d5e822
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7236

Heuristics 5

  • 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
  • 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://originalbau.hu/imagesfiles/17304237075.pdf In PDF document text
    • https://sharjahcements.com/images/bulk_images/files/nijewiza.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/fojevinusolivaberaluvu.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/nejejotukigexura.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/vozik.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/vowuvon.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161440368c190d---93161558540.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/girewo.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/90901591606.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/vizav.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/45683675777.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/kebiselabadokapu.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/38557615432.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4369557aa---figivozoxus.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/bobixaji.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/simodadafilosaro.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/riwogotisoke.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/73345540639.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/misogojamanaverox.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161395096b440c---64438700900.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/xidawasujobuti.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/vojupumevosopew.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/30677575615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gangstar+vegas+latest+mod+apk+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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