Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c58308e957d5e0…

MALICIOUS

PDF

92.9 KB Created: 2021-09-03 17:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 09456070c3f6d193023c8e4693e84e7f SHA-1: 83552f000a4a81f34ab1deb383ce5cb32b2499b0 SHA-256: e4c58308e957d5e0053272a427bc5d6504991dbc49858b884362581991a391e4
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 0.9965

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/007e2f8babb773d4fbfef1d2f493ac39/fobinikinudexi.pdf In PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/75039499281.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/kenamalozupedivetab.pdfIn PDF document text
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/66839426239.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/texutuwefaze.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ecff114c---lovukizadowutizi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/75b3d54l6nsrh5na0ad601rh85/gizesetozelejaduremiwet.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd570cac42---lalatezidunaxiv.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/29483776227.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076088142929---66695743671.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9ff93f3e83c862fc564d78a570952b4b/ribotuxoxejufeximufunofoj.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/nalomoxomigepoxega.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607632732ab3e---pimuvotufof.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109863a38cd4---neduxikodoxokunonarebupi.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/mepokabinama.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb271a36---2938104577.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/perijivavatoluwevino.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0c8ca71b7858c550547d882db3f35dfe/21488899517.pdfIn PDF document text
    • https://dalba.net/other_files/File/selidetizixisodepaber.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/88022685801.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/71616524625.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/15345917028.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/pokewunu.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/78121060254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=4+hours+work+week+pdf+downloadPDF 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_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 10664 bytes
SHA-256: 054b77cb29e3cbd05999bfe23bcf7731c78a4f3006d64aa84259dbe158823138
font_01_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 18620 bytes
SHA-256: 3feb02047b6625d4550d1bdd2a7b9cb399f4c121c65b1bf59ecdea6f7fd8a5d6
font_02_sfnt_off00014d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1