Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4862e111dc45d0…

MALICIOUS

PDF

68.4 KB Created: 2021-09-13 16:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0de277e80383e4555515f49ca1fedd97 SHA-1: 0cfa2ad98eb13f6ead775eee67fb5599c7378633 SHA-256: 2d4862e111dc45d04cdf264f5c09a3f8ad235e23de8c76a4682cea08ad044866
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=dr+seuss+game+ideas PDF link annotation
    • http://goldia.cz/data/file/46795680984.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/74664869035.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/66944892186.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/josabegokojidepifisunaj.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/37636273599.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jujitagevin.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48950d4b9---labigobudazak.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/kurivadixefexilidanalox.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/gedonukobomapaladikiga.pdfIn PDF document text
    • http://gewald.ru/content/Files/62350340680.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390578cd5a2---kowezuzi.pdfIn PDF document text
    • http://actinq.nl/upload/file/18504709606.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc8fbf04f---4289947357.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/33430090233.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/kokelimiji.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/80724965869.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/6700380147.pdfIn PDF document text
    • https://dcimx.com/files/bivufanutixifi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320fb050658---fiwigepomepap.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630686804.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/11001585478.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zadizapilovelijimameru.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/mapeginumelebitusidex.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/74107047861.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/fanonasigopator.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_off0000c724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 17256 bytes
SHA-256: 77a7729c069d4a16848ea1f556b59e16858a4e22ae7cfd9dda94999a6dbca090

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