Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df2f171c46a1a4e…

MALICIOUS

PDF

54.6 KB Created: 2021-09-15 12:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bde0a5995e71e4a3df9f72876c618865 SHA-1: 985ea412c095b4b110c22a667b0ca23e3f9ebb52 SHA-256: 7df2f171c46a1a4e5e8ec697204be6bbabd188b2ca55f890ebe6e258da8b414c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7568

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://inwebjor.ru/uplcv?utm_term=dav+class+8+maths+book PDF link annotation
    • http://jtg-antracyt.pl/files/file/31204979113.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/945561110.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/winitowebexudekesufatu.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/41599859156.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/61551174980.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210906025739501.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/makunijijibelujedebilo.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xafubovamakilejurotudekid.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109021058538047.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/93628656236.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/39698933402.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/mijurevixilefagaxaki.pdfIn PDF document text
    • https://dalba.net/other_files/File/sulodidepexokolizisulusi.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/33276402331.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hk2vqrt096g1sbipo520protjj/36706742521.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135dab766000---vogota.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede604ee38---90960306546.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/59886423927.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/98499297662.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/54243706073.pdfIn PDF document text

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