Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df41da2831fc404…

MALICIOUS

PDF

55.4 KB Created: 2021-08-16 18:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da84f1844d89a54185d651dd43c41d87 SHA-1: 388533ccde4c8cbd4b30b8bfb4b638e672d88a05 SHA-256: 3df41da2831fc404037fd27866587d8b029f1c64c93f6bb5c1284d0096689674
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of multiple external URIs, including links to compromised WordPress uploads and a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6099

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.
  • 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 http://commune-bourre.com/userfiles/file/rewovemagupu.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a00f3404837657e68655ba1c62dbf198/19590628724.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/ritiwesonuv.pdfIn PDF document text
    • https://bloc-immo.com/images/81846090459.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/42358055900.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/54fe397f178b83f22480e44d4ee2ecd4/lamotetufu.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fowogotusizitigiduzur.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa24603b8a7---96949581691.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/posujaxuxezepobomudob.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a469ad9c423160c9f654ba1f41cf1d34/54718921307.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113f87c6729f---29757413100.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b3cb6d69---daxajek.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/26167651906.pdfIn PDF document text
    • http://vhshf.de/File/buwasop.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/22106301817.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/zomokazogafofato.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/gibasajop.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/9648700578.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/40821879480.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/wiverugigaladax.pdfIn PDF document text
    • http://npas.ru/pic/file/ledisixosab.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/e6ff42488facda2a26523a55c6af4d1c/falojererada.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/97425720178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=top+10+outlook+email+tipsPDF link annotation

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