Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9c0bc72a52f2b8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 14:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1506d0449d84b8bb7dae981e04a7cd7e SHA-1: 307a656dfff46f70d3cfc20531ff69a44c2ede62 SHA-256: 3d9c0bc72a52f2b85bfbad4c668a9a51501dca06a26d9691c4958e90ce8ba1d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and a link farm structure strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6012

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://catamma.ru/uplcv?utm_term=advance+wars+gba+download PDF link annotation
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jejosora.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/noviv.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/59257922171.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/92972988233.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090422585468.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dedav.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/wonakomigokok.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rsk25pt69hlpl00umo4q4ijuh6/nobul.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/saworukiparagugi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c22cf2d5---nowuw.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/35231465927.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/fapaxelawo.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/lisoxagetotexub.pdfIn PDF document text
    • https://palet-school.com/files/files/15753357192.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/voxirivirek.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/marekunumeserekirixowik.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324f8582637---98514618367.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tb2j4qqsq9eja9vv289hk7g5ap/xomujaj.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kosonozexer.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/jipipa.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/8329270921.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/kozavegevalidinig.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/39757886186.pdfIn PDF document text
    • http://specimport.by/files/files/pigokagopodasoba.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090712545873499.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 20040 bytes
SHA-256: 79fe80b1e2a5aff2d1517bcf30918e01eff8d3c5245cbaf61944519dff5531bf

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