Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae3f358c9edcda8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 02:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5dc7b76f639e1016fa53f79748c3bda8 SHA-1: 6525be5884b7bddac6825c55e4a42dda29eeaf3c SHA-256: 5ae3f358c9edcda8c05facb11e3237710eb7b635672a1c88dc15ed460de31aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=transporte+activo+primario+y+secundario+pdf PDF link annotation
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0494be29c---23128650712.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/debixi.pdfIn PDF document text
    • http://kotolantopeni.cz/file/nudokilux.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vq34e6j1r819aot20a56lib3s9/majabuveruvu.pdfIn PDF document text
    • http://mobitransjogja.com/files/dozuxulese.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/9925626492.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d1963453e---53016394942.pdfIn PDF document text
    • http://compsult.net/userfiles/file/rexune.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/89852660793.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8720cf22ec---19154355311.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/89281591412.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/55030602192.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/52773498148.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109031331148078.pdfIn PDF document text
    • http://nensi.si/upload/file/pobasoforigitid.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pofux.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/tipedovuxixik.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c363d77f---74563756613.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/zedakob.pdfIn PDF document text
    • http://koddous.com/userfiles/file/56981859399.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0378eba328---93197074519.pdfIn PDF document text
    • https://airshow-bg.com/file/47596686207.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7d7c73de3890b5e0732d48d6b408258d/22784668439.pdfIn PDF document text
    • 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_off0000b7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 10976 bytes
SHA-256: c68ad488fcd4921e38bbf905b8f2fa9f2f9054fe2d52536e3c9d94cd8aa45bbc
font_02_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 16036 bytes
SHA-256: 047e75ee18a69f00502ab62add3378592099b1668206cc7977439f5928c4c1f4

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