Malicious PDF — malware analysis report

Static analysis result for SHA-256 478553efa5267cf4…

MALICIOUS

PDF

95.6 KB Created: 2021-08-17 15:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a485a07997cd2092c21437c40d85b8c8 SHA-1: b50fd6db52e461e1f5bc4d5dcf78a1e53fd265c5 SHA-256: 478553efa5267cf4173c69f1a003121eba61a9cd884ed8ca4a39651179dbe120
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains a link farm pointing to compromised WordPress upload storage, with the primary heuristic identifying a link to an algorithmically-generated URL. This suggests the document is designed to trick users into downloading further malicious content, likely a phishing or malware payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3837

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://internationallanguagenavigators.com/media/zobimugeku.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d1f85a39b---77513979852.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/97023422365.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b490ad4f935---digubeposefogumen.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b092edbe23d---vedobodopilapox.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/26302649390.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/28658312610.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc5bb6566---29489111211.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/bafixanufojadovatujoxipix.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/vusetukesakubajujedinitub.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/sigidurikok.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f2bd3a7e117bf4200c00983283ed059a/10442253350.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/tozaj.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/pakidesevumufatoje.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/98824023272.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/2344993302.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/49538662641.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/81462682419.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/wajalerilomututopomo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/famizol.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/5785560437.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/38801306052.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/49885287975.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/pifazatudekiturenokujifot.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/vuxutalazedegagobakagik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=who+wrote+the+book+of+jasher+in+the+biblePDF link annotation

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