Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae53f1c76745a590…

MALICIOUS

PDF

70.5 KB Created: 2021-07-18 21:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5803a81a57d3fcffbd79ee45daba2cad SHA-1: 52d00169006601e07326bc307005ed7fe039a049 SHA-256: ae53f1c76745a590ed7c8712d9e3f058e34663eb1bb1c925ad7670620631f21e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the structure suggests a link farm designed to manipulate search results or lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

Heuristics 5

  • 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.
  • 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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/231b9a30b6e4e37285acab10a49162c6/vobabowuzufav.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8e6d711c---bubewatelul.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/9128489054.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1625637969.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c2ec9616b---pugegorivoviduzapu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608378359a6d6---76553754153.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/nixekorebogirojowama.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/fekifetitadenerunolajegu.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/beac220798a700edd106c9c0f7cf16e2/76793592837.pdfIn PDF document text
    • http://gardatrans.com/content/Files/nijovenimubozetivoxiku.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb980358d5---87153866159.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/74e696aae58d15b52731c34d431f16c6/984079047.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8bcda282---85780628342.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/zugizuzajariwum.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/mabagozuwigawofokinikan.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3738ebd1b---witunemisodotobekibifedep.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/lawumub.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856a2df0b17---3012022807.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/lakaredoworobowez.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/sudivakeb.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b258c50173f---gazawilanometa.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zotodiluvilowaroz.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/c1nvb8nrm064q4bpump2lppub4/12077744910.pdfIn PDF document text
    • https://bataretak.com/img/files/file/10815666106.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/gujapipev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chatting+format+for+dating+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 10628 bytes
SHA-256: 4c4d2a805465733daf2ee7897c21c2adf27570d65836e520ff23e6340623556e

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