Malicious PDF — malware analysis report

Static analysis result for SHA-256 508d3b057b6ddda8…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 04:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 266f528d458747b576c20232b520c1d1 SHA-1: aa17d8f270bdfede45c75afdd4452e27071b8a54 SHA-256: 508d3b057b6ddda882db7d7beb8e1cbf7231926ae07f13735f71befeaaf8200e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nutranghongngoc.com/media/ftp/file/6202106132.pdf
    • http://kme-kme.cz/files/file/morevetako.pdf
    • http://ahlhy.com/uploads/file/05134425336.pdf
    • http://keralabiblesociety.com/fck_uploads/file/59350993461.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/850024223e9764e44451c64e01dcd1c2/buneke.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kazodoruvetemutaxivefusi.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a37621b26---90060175424.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7ede7c7d1ad8cec6dd70dc5737fe31ab/fujunurulefi.pdf
    • http://ikkosushi.com/uploads/files/nuwejawezanufiwik.pdf
    • https://al-farh-iq.com/upload/userfiles/file/82352467385.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabfb5c468---wemev.pdf
    • http://myapartment.de/web/editor/files/22477262249.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ca94f1b7---48878226964.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa869a81b5---79744943649.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qmsetetg4dv7h79ldebodatcq5/jozotut.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/aba55bdb5570eb278827d6e6f0b4dc5f/79479299944.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160961f1063ad9---48223199316.pdf
    • http://consol.hu/images/uploadedimages/file/12296264869.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde367d8cc---56971750749.pdf
    • https://aartipalette.com/userfiles/file/mumexogufinugigonimore.pdf
    • http://angelescare.com/userfiles/file/55364299267.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73611c209e---71896059261.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1b5358467---vevenedisoweto.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+turn+my+fat+into+muscle
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 16792 bytes
font_01_sfnt_off00010771.bin
d75f08bca4332a3b0e8095a0295784e97099a165e4f19eff7b6bf5c4291a2cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 10928 bytes
font_02_sfnt_off000120cc.bin
a59ddf3a5d12da13e34e13b0ef1b8851188d9c76b6cbb245b2379eb2ad110ced
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 17076 bytes