Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5533a474255ca40…

MALICIOUS

PDF

54.6 KB Created: 2021-09-19 19:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f87333266b558024c1f9b81524532ec SHA-1: 76b2815f6db45319585ea367d8a3d2b87fe66236 SHA-256: e5533a474255ca400c7cfb1884d09f54e4c5b1271e4e98d258d7a77165f471dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to compromised WordPress uploads and other disposable hosting, likely to lure victims into downloading further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest potential for exploitation or redirection, aligning with phishing and malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6441

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://bijverhoeven.nl/uploads/files/tamowelarigesusirop.pdf In PDF document text
    • https://manorhair.com/uploads/files/202109132152001361.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/42371655037.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3b1585cb67ead2fa45c30ecf72724dec/91762866892.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dir80scpo561ls4gci7vvqfmm7/10833666343.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/74842111898.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/34332299771.pdfIn PDF document text
    • http://strap.sk/uploads/files/zovobupililugej.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210908_194422.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/91646486739.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/42661571534.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/zijelonude.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/16734318150.pdfIn PDF document text
    • https://quizai.com/uploads/files/87338244815.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/bewujawizomomozotemi.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/tibakamubobu.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/xokagukitasow.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/26570863579.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/nupabetoxani.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-18/20210918083108660353.pdfIn PDF document text
    • http://receptlap.hu/files/90477692004.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/46118324124.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/52483154178.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3590804fc---pabumenig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=network+cell+info+androidPDF link annotation

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