Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a520869f60080f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 04:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3bb6512f059d23b4be7c537767e06cda SHA-1: f43e81ae16a6faea87c53269f71a77eaaee5e50f SHA-256: 52a520869f60080f07a89c6c7a1febaa50a104dd4dd1ff899eedc98e0d9d85c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://krisoc.ru/uplcv?utm_term=corneal+dystrophy+and+degeneration PDF link annotation
    • http://notarbrazda.cz/userfiles/file/53490538782.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/95b9c0c8aae8e8110df496ed27d7fcb2/gitujibikosodimewemakex.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tagapotadosorop.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/60673683293.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b601ec13---20403206497.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/7db76f29c6db0cf4aae7a2539df55ed0/8513493687.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae6046b3ba---watibodobowirexepizi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0r3ksn2knn4jnp57aa3ng2f2ro/lexurotezowa.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4b6a941e---ludabesemexuf.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/lugiwilaw.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/52871238305.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0499d480e---19663966984.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/44925989649.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/lifidexuwuj.pdfIn PDF document text
    • http://sivam.pl/files/file/81582855847.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0461b514---wapoxizozumaborujagomogo.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/zekezudeboteju.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7843bd2574ec9187c53c423eda875187/70321507680.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16126c66dd70a9---4774427379.pdfIn PDF document text
    • http://mfahk.com/upload/files/76153626331.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/90407726422.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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 10816 bytes
SHA-256: c4e469c84a26f3f570ca51fc13c43748da62a96fe8a7d45fb757d0b3545b8542
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 19948 bytes
SHA-256: ccb9206482fe284c92d0220e3fbb8c7995907d5c8037d21439da980303775ef8

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