Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d54b25bf70324b…

MALICIOUS

PDF

47.0 KB Created: 2021-09-09 16:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d76ef29e0bc6757e3f8bcb39b8bd23c SHA-1: f12724faafc5afec1962a240aaa0d96ff32eb05e SHA-256: 47d54b25bf70324be3a151f0cf48d0a1e5141ed4246a4ba5e9fc8884097b7748
162 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, including links to compromised WordPress uploads and disposable hosting, suggests a link farm designed to distribute malicious content or phish for information. The primary function appears to be redirecting users through a series of URLs, likely leading to a second-stage payload or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9202

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://synerhu.ru/uplcv?utm_term=how+to+add+png+to+drawable+android+studio PDF link annotation
    • http://reelproductionshd.com/userfiles/file/jeritadizawowavagibapap.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/81581550031.pdfIn PDF document text
    • https://maisonforville.be/documents/file/nelomigof.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/xumobu.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/nomobibejavunolajuwulefaw.pdfIn PDF document text
    • http://briztravel.com/upload/files/kegaf.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/gorukulexodenexakokez.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613990f85e86f---ragekajidetusifeka.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/24455744905.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/zanudaxewuvoxibawajitog.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/zosazebojolinaxuvuwibup.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/zinufexufatekonubojeliwig.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131c531030c7---gewofeju.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131abc266338---buwosilobejimuronerigiwer.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/nogule.pdfIn PDF document text
    • https://coluer.ir/documents/file/jibizazo.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/fujewuwetotokodozole.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/koloropax.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/finufuz.pdfIn PDF document text
    • http://opsir.eu/files/file/14254676163.pdfIn PDF document text
    • http://liily.jp/upload/file/20210904053753.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a4d5375d---85505933609.pdfIn PDF document text

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