Malicious PDF — malware analysis report

Static analysis result for SHA-256 944dcc94aaaeb7a5…

MALICIOUS

PDF

56.7 KB Created: 2021-09-15 18:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89497e53f5028e793044d2c28e2ae079 SHA-1: 717ea81e5b821ecf4ddc46436c6f0e91543e0d5b SHA-256: 944dcc94aaaeb7a5d95741368251e52c655ede9f4d6c51126991407dc8441c02
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5305

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://hkbroadwin.com/userfiles/dogusujumugegojimepogif.pdf In PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/gudilugibitipewe.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b27469554b690ed14205dd642218c0c0/54589324305.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/vipireradunamijurokox.pdfIn PDF document text
    • http://seamacros.com/upload/file/dotularo.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/12351708545.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/fajolabinudut.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/53726893428.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376689a16e4---tototaviwomab.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/dadexiju.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/benazafenumaza.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/kilofinefigefojimofufug.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/mogazuvojofigunu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7502891a---rebate.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/muwunupivujovoguwid.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/814c38f28b91c8fe9e1f5f2b7d4f8479/2929353043.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/lipogajamobakosunow.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/acen5o6b8m0o9asj5sjsq2vdsu/76191165493.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/zudefovag.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ttkkg8p3mrtg76ba4dr942380h/sifegaxokodiwikidilakavo.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4492abfe7db1357f55d25576420984d3/82039606158.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/woxaralomoranisukur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=blank+periodic+table+with+symbolsPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/lozomoluzi.pdfIn PDF document text

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