Malicious PDF — malware analysis report

Static analysis result for SHA-256 4057f0133baeb3fe…

MALICIOUS

PDF

79.0 KB Created: 2021-07-13 02:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1e2bff8621d745aabca6d2b390df395 SHA-1: 20bdd6ea454a94ac292ea2faf54f561f67e1b06e SHA-256: 4057f0133baeb3fe9db8e559b9ffcfc688e55e2c56ee4cefae9a7ea8bea4fc8c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to compromised WordPress sites. The ClamAV detection and the nature of the URLs suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=eat+that+frog+ppt PDF link annotation
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5067308b3c785314d33e0db185d39db7/panononizanojokawugi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1cf9bb9e75---jasagadesekajedilow.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/6257073355.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/98391988134.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a4ae847148c42b0410517e84c31efa3e/mijote.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c443ed68cba---63019006297.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5c275bc8b56dfe086484e25e725f7950/18826592224.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/24466540006.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e13a1ef57---23733265796.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4a6ecfcbdd0d31d03400598388078566/94126488378.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/mokoderamigako.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ebab14da---6555491295.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094b641ee88e---90471883169.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/salarubozijejebukigudako.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e32da752f87---93556176738.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f860fcee272359483b77387bf7f5093/lelar.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/kajijepaxokap.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0964700a0---tizavabifefepojuloja.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/6d2a468d18d7a21f808e3b2ad70fead3/49393976657.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c3b8dbb0839cc6cc6651204f70545f1c/toparibewitaduvuz.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/meguwe.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fcf8338a8---sewoguxoseleniwap.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/lkoj2evhas9hrb2h36j8ocmbud/terilawu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecdffa68aa---41785291076.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 10076 bytes
SHA-256: 447d189ba3f0bb1e3da5b93dbb419e2098daa9ee4ae856d1df6871d80c346dc6
font_01_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1