Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ba2d9b675a1129…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 11:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8e0317d1cb929f89353991f25dea241 SHA-1: 3c4e6ae69457ecfdef46c1e31884167ae9e0d64a SHA-256: b1ba2d9b675a112939a3192b860a3f93bac042ccebd00e86dfcb48e2ec661705
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to various websites. Notably, some of these URLs lead to compromised WordPress upload directories, suggesting a potential distribution point for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://salt17.com/userfiles/files/gigivibol.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390a224084a---32435570983.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/11584489520.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/50863292823.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/pasud.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/88552114125.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/tipebuwoletowalufajanuke.pdfIn PDF document text
    • http://moneymaker-gold.de/files/kazubiluluro.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/temimasakan.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1382efd1bdba646181aba86b096d9d4a/mexugapabukifobirafoged.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/13525970773.pdfIn PDF document text
    • https://kimcert.com/E/file/67436029915.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/69hhfqh03j9kp6i111dpsq05h6/16356629769.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/64730284452.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/pituda.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/33922580498.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354b41cf690---55948210270.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/87485226987.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b5a0920dce24d9a6ca772e3488b9441f/jonebovagomaziwasogakuvi.pdfIn PDF document text
    • http://e-sheremet.com/img/fividugemufozirexi.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/zesamigagakeji.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/febetaz.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/ruvumamexokotozeravaguto.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/4853200132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ubtv+android+appPDF 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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 10252 bytes
SHA-256: 734a8379f7fc4fccfe3cd4a0d67e997e6a7a48e7f7a95a28b59a16ab83afc2ef
font_02_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 17860 bytes
SHA-256: 4e7a156822506984f5c36b4e719abd991506ecf5037da87c82e6d6914df49e2c

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