Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3716e85893f5fd3…

MALICIOUS

PDF

47.7 KB Created: 2021-09-05 23:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8dcebf6c8ff6884255ae71fba45a336 SHA-1: bf8c42cba4a77aa01d0eb0b45ba653a7d00c2d41 SHA-256: d3716e85893f5fd3776d16d74c041ce8adc13553edad799417b6c99edd3bb45a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve as a distribution mechanism for phishing or malware, leveraging the compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8075

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 http://theclubburger.com/uploads/files/26786788722.pdf In PDF document text
    • http://polymer-optix.de/userfiles/file/70239983623.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/keganovisaz.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073f04453802---81473967938.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d2d6a0680e8eed80f379bf22d484cf6e/7087985800.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/pirowuzobusilo.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/63865166098.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/jonomizodebeg.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9c8123ac---76515910910.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160971b7258d4d---27857062815.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/95514944548.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/455f2uu7t7ng5l4rj5vkb1fvtk/bazowazexa.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a9cffe45e3---2908278189.pdfIn PDF document text
    • https://yodobashi-church.com/22959576647.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/87461bcb93dfbb16fc2098208eee1742/77520085448.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/wujenelifavukofa.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/sebawelonizum.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/nakideliv.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/72292420939.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5vte1u3s218lg8jt402b4h1ld6/95724640179.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8btqdre7qae3u9o8htu79di5lb/mewuge.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160faccccc5534---47776988778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rounding+numbers+to+the+nearest+tenth+worksheetsPDF link annotation

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