Malicious PDF — malware analysis report

Static analysis result for SHA-256 31368f7363ea906b…

MALICIOUS

PDF

51.2 KB Created: 2021-09-03 10:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2fb72f577a54c9b10bc4e13449e6afaf SHA-1: a7f899f43a16833f2f179c6ef0d913f47738828b SHA-256: 31368f7363ea906b7347b0ee0a348cc305a27112950fe395fa06ae4831d53418
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8037

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=rapid+interpretation+of+ventilator+waveforms+pdf PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/h93nv990smkpvpg232biqii960/xugarat.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/fisipegusad.pdfIn PDF document text
    • http://texmet.pl/userimages/file/25454980943.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/66807816351.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/xilijemilologajez.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/zijewub.pdfIn PDF document text
    • https://ever-progress.com/upload/files/sexunigatix.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/muziwabuxopo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f3404128d---48230301834.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/6566901217.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/39c663d5f82ff1a4cdd33d5c20180979/nafozawizomul.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086003e27f3f---17734288595.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/babbc2b4f2817dc7a00ad9e9b132613a/kovowuzumanudejekekilag.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/mijaxeromarawozasidetuxar.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/73782722017.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/riferemivuzerizodel.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/84458492744.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7399c438f0bc7706ecce4742e1fc6aca/52993363689.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/gabeposoterolifugit.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ca8tn320jbkbecarl0o8to3of7/tofibewal.pdfIn PDF document text

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