Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0d4216fdec0b3c…

MALICIOUS

PDF

61.6 KB Created: 2021-09-24 22:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 892d6ae56cbdd75a7d3211396550c28e SHA-1: f2512134c3820b972f475ca78309578629881437 SHA-256: 4f0d4216fdec0b3ca5f5b1c5496ea1fcf2168ff0704ebb046d8fb8ebd421d2fd
162 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript and a link farm pointing to various PDF files suggests an attempt to redirect users to malicious content or download further payloads. The document's structure and the nature of the URLs indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ringid.vn/ckfinder/userfiles/files/fasupabesupus.pdf In PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161494d7bef10c---fomewagoronuboronanimato.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/lotokozaxopebojidixe.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/74391747151.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/xaranagewimutunar.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/12030192112.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f94dec9f---70883372089.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210918212027.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/lexatoxewe.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jipojosapo.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/dedaxezijubago.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/68052814232.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/30574008200.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/jusexax.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/91735178882.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/54720575821.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/53938726149.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e72d155f6c---mezasenunedujovesore.pdfIn PDF document text
    • http://orenprom.com/img/account/file/sunatawuvasazi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b32ff1d177---selarepeme.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/tobisix.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/13966887046.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/lametuxazulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+wireless+file+transferPDF link annotation
    • 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_off0000af49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 15348 bytes
SHA-256: 49798eb5dd42d7d5187284ec5c1572573c16e4d0b483cfcafb376d172b046d95

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