Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d3409c1f229f8c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 09:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 251b1b97a0baa5e04588ad80beacea44 SHA-1: 81ede16af86ee46011692fc0cc1bf6eb5b9db3f9 SHA-256: 18d3409c1f229f8c9c4fef44561220d30327380670085db17d0271ac8bc06da8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially compromised CMS upload locations. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7216

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 https://lean-ds.com/upload/editor/file/19554540475.pdf In PDF document text
    • https://studyhalltracker.com/files/file/47063333295.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161350d559fb15---1395117565.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/gilekupogituwekasezepo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614592aa23322---39844574841.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/jolazusokuxudulobiposani.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/62663651167.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/42605907933.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/kiriwajawawofisudowumujik.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/52963763587.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae0e0c6d1---83164770349.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/41061150853.pdfIn PDF document text
    • https://questyme.com/userfiles/file/99926164419.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/9125967946.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/loforixuwixofokokal.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/6833033670.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/18256300472.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/pibolisazizuginivivawo.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/41229929681.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gedetoregililusotaged.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/buruxokisukebexubi.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/salizolobananigesukegaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+deleted+photos+from+phonePDF link annotation
    • 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_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 10768 bytes
SHA-256: 97c31aea4707e16237abab22a5a41971837b056e503aaf08b67bb868619a667c

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