Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91814a909efe56a…

MALICIOUS

PDF

65.1 KB Created: 2021-08-14 01:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 538d1e9d4fd589bc7e86ccd897373347 SHA-1: bf21bafc17c7aedceffdc6bbc13f9214675585c8 SHA-256: f91814a909efe56a026798ff8ad1cad142b7a5e3f447793cf511a5bef3653b5a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links. The heuristics indicate that these links are part of a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6241

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://queure.ru/uplcv?utm_term=rise+of+nationalism+in+europe+class+10+notes+pdf+in+hindi PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b607f5c3e6967272a164a49d63587a14/93959828584.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/1c8b6f8147a31ec2b068860688457092/jefazajirojetewideli.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/6937890216.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/falul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2bd0a41926---4992102056.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc95ac29c---suwirasagana.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/vubawogixepiloxadori.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/45700290856.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/zidexekefoxifavosorov.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/87668559917.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/3497402972.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/turemodavedonixatorojeb.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/7vk5ag258bcotj2qpou0nu8rj7/siloku.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/77315342213.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/db036ddd5dd018da853cd9afe2df03ee/sigaragubek.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/45779356253.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/57861456710.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/21c3bb94a5fe1ba85c004a3aa8461618/jediw.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/29375420200.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/vomewozemarovup.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/np2cac07s0h5udhmnderh5f6pt/62761011897.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eecf85f97---xejufofajetapix.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/97485461163.pdfIn PDF document text

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