Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4f280ddc7f333a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 18:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9e984cd4e0a6da2ef27945c57e3f352 SHA-1: 85f9c7aaad9a0a3649dbcd61b4b9a6c7b3a8d882 SHA-256: 6c4f280ddc7f333af88537a375f218e6f76557a7600cd7cbba66a7a2292a8fa7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to domains identified as disposable or potentially compromised, suggesting a link farm used for SEO manipulation or to direct users to malicious sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://byecook.com/ckupload/files/sinukalimebosonaduwetopik.pdf In PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/42700989671.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e27ab534105---91403588798.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/ruxogowexidigunaladixim.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160849394ebf6d---dituregeguxufelonugixeke.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9f750f28---kidekodezowerogaxaroxa.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/dovuvaxija.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fc95c4419---kedovokifalowumigeje.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160716b689b45e---44845420648.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/farenuse.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210529010135_835156655.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca011546a7a---77968263994.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/22585609495.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/477878d1caf7573f546abf52bca085a6/89609433536.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/58201623308.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e6a756c0---misodulikenekuxemetunux.pdfIn PDF document text
    • http://aven.su/userfiles/file/53646363320.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/pamegagipaw.pdfIn PDF document text
    • http://blatt-gruen.ch/files/16003079646.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61d4cbdb0---kofobofinosifovifimaxit.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mom201p4ffiegq5n36bcltkj23/64026502640.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f02a7e9cc---pubipazidolomanom.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/94227823744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=riemann+integral+definition+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
font_00_sfnt_off0000c1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DF 17612 bytes
SHA-256: 9dfda3767cd24950167d7d1159b0e80e774628dae4f8ca7234dc62e53a3476c3
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 10720 bytes
SHA-256: 14268e85555b0786d9917fde59896f831cfe9935f3d2f737616b13fb815ecda3
font_02_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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