Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b73cad50c46efd9…

MALICIOUS

PDF

59.5 KB Created: 2021-10-01 05:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3538736ab08b12da675701a311c38684 SHA-1: b292cd47533606a7c6f8f8a6bed3dc5dfbbf69fa SHA-256: 8b73cad50c46efd95438777469ff54f18eb47991b7b9337350d5f42a5cbda4bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to act as a link farm, potentially for SEO manipulation or to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8143

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://drafthe.ru/uplcv?utm_term=rock+paper+scissors+minecraft PDF link annotation
    • https://investir-petroleo.pt/ckfinder/userfiles/files/39016523266.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/didorujixo.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/39521154970.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/modaxigedo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/xebidopazabewonevuneweru.pdfIn PDF document text
    • http://acelybio.com/upload/files/46681986583.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614713251cf69---86813986642.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/vudusupubonefowuxuv.pdfIn PDF document text
    • http://retailcop.ca/files/54652658848.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/1254318203.pdfIn PDF document text
    • https://tch.lu/files/files/gowomikujuragifateg.pdfIn PDF document text
    • http://heizler.hu/files/file/13684346960.pdfIn PDF document text
    • http://scantech3d.com/files/4880622549.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210929183011617785644.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/nusekoradelagufunixiti.pdfIn PDF document text
    • https://sapporopools.com/contents/files/99483743815.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/11280727218.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/donubazasupup.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/kubakopomi.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/kebapiko.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6f56083afe41c85298e3b2561f2496aa/42461050430.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a2ec2389abc30570744a7dcf736b0fbd/pafopojo.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/disabor.pdfIn PDF document text
    • http://djpress.pl/Image/files/pofobolabutebufapixi.pdfIn PDF document text
    • 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_off0000b2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C1 16664 bytes
SHA-256: 2ab44906f37553dff94e4a20c1671d37aaaed05c235df921b1a36b01cee94b48

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