Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e3a16757b2ff9d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 17:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 050fcccf11f25a53b925ba5d2e2b9000 SHA-1: 8711b5a8f712bd0bb3c6475ea319ef7e04f09f54 SHA-256: b1e3a16757b2ff9db7f53a12971d3588ab7988256244e099c2ddef8eb4253725
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a tactic to manipulate search engine results or distribute malicious content through seemingly legitimate but compromised domains. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f8a48decdfb6ae897d43f29bbbcaaf7b/fefod.pdf In PDF document text
    • http://fluitec.fr/ressource/site-image/files/54071529999.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/97494c1f5238e44852b46de8b9dd11db/fozarabe.pdfIn PDF document text
    • http://kccmaul.com/files/files/62316391986.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/nafaj.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/85223501904.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887044ae7a9---65727081280.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/nagide.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c7fc064ed2d63507f889d29d325ff41d/natukuve.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/uc37gpa6rtn3d74sgvvqu18b7g/72777137887.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/cbd3ded9df0c30a9277860882b87115d/51565195245.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/pawaj.pdfIn PDF document text
    • https://highrise.pl/file/90841278430.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/64415419813.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8e454aaa8f6e7e468574ddbf480e3806/gowawirekafe.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/21242660468.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/90261031897.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f3aa43c34edd19f7a26076d92ccab110/xirerogozewoviseneputax.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/kajidajolijotamirodizu.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/57468417032.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/81889104540.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7d64e1f28867d87ec8d4c213378d510/gijugolumifizirodekurora.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/dcrk6kldg8j9k13rvg2e9s0lqg/89309445119.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/60e19159655036de9527b60130aab7f7/tatubowinelagibuxi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0oha1k9q4bjn6mieu530c5juc0/kobolajepuwikot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=human+resource+management+gaining+a+competitive+advantage+global+edition+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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 15880 bytes
SHA-256: 086918a3f46d3355ee1bba95595c46f57d02e0109adae1bb4e2b9bf7dcb73a84
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11605 11260 bytes
SHA-256: 7b36e55fa099001d934c335e1b8fb2ef6ace4c305e4039ab61173937dc94cc82