Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26e92f892148a4f…

MALICIOUS

PDF

90.8 KB Created: 2021-07-02 19:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e2856e77b38f07bda9acf29c7456c6ae SHA-1: 79dc7bf406519c4d7c607a2ee7c263725ac13834 SHA-256: b26e92f892148a4fc8d46fa3287fb2c348b55e692010ab9015221ab3d4aaf39a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0def959ca---96799416954.pdf In PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/5f7e02770602d8d51191eda0f3cf113c/66754897233.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/32163061453.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b668d3ed9e8---rudobuwezipepaxutidubisu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608293e92f4f6---bejowojovem.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b0e2e05aa45832eabdf7ff3446a2a576/rutase.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095803ae1e3f---vomevuboxatupogel.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/23084264ffa29471cecbb6c6416e5170/tomemofopipumaxisu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50901612223.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/noruxepebobaseretujuliket.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608667992b01c---junesojevixedol.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/wezerukadelosedip.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210621215355_1717273270.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f5b38ad94---zefivabuponib.pdfIn PDF document text
    • http://ddmlife.com/ckupload/files/fakomopinepani.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/34754631588.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/fogiloletirunirob.pdfIn PDF document text
    • https://egca.fr/userfiles/file/nirogamuvigezirutalaloles.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d117841b30---87145680458.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/97798007706.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/53107960505.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/468b5e97d6eea63de6199a4e438beca6/47943755623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pdf+to+html+online+conversion+toolPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 17264 bytes
SHA-256: 2b29205298e1128373f5c074c7b9f0e48888f997063650a348a2b8cc9f91a2bb
font_01_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 10644 bytes
SHA-256: afa8bfdd596bf41367e98d6cbc0af3873df12c1674cd5b70c647778c7e7207df
font_02_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001555d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555D 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500

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