Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea71000303ad8c4…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 23:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4f0b68c6fff0f0c5ebbd8cd207c16f4a SHA-1: 61e5dc2ba01c0022e00dcc1c9a7118e5db54b02a SHA-256: 2ea71000303ad8c4c1995ece5ef6c9dfa8d89af7a91e280e44cc756bebab818f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO poisoning or phishing by directing users to malicious content. No scripts were extracted, but the structure and URL patterns are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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
  • 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://boumqueur-edition.com/upload/fckeditor/file/55154714317.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/40511231432.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/4bcd0c86cf5e8d0412b46ff746eadd7c/67065872774.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01eb79843---75040687091.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/41324043882.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/luxugivurofebibimazuz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868cb9500cb---15587906996.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d0346504---motufeleposamazumijifama.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772aba1c523---zopidatanajalarigo.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/fasarimapubuvikumutaxaniw.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/wedakexawobevuzawu.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/lupamibaleketubapu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/66814412956.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hcnlieera1hvof695pvt2rro2j/23491711209.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jexevefumijulewikos.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed24e202b6---kojesiroz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de450923ea---zijimev.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/69357863817.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/47541222026.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c7135ea12a5351381a3ba7519112454c/35791632024.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/wijugigegevakapetogeruniw.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/19010991451.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160da4b3d6bc77---jesidus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=angle+of+depression+problems+with+solutions+pdfPDF 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
stream_002_off0000f7d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF7D4 19988 bytes
SHA-256: fe77bf1ed9efa32a7169838234b25c8b17dbd1f4e59f004a71f5e1dcef98c0aa
font_01_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 11092 bytes
SHA-256: 9dba5adff7fbac13de85c6649012692a5c7c348ca5d345b25887f7f329c6f8c3
font_02_sfnt_off0001469b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1