Malicious PDF — malware analysis report

Static analysis result for SHA-256 b237575ee2d4e89f…

MALICIOUS

PDF

92.7 KB Created: 2021-07-07 21:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 682a6d86f50e9e7723e2c8bb44451752 SHA-1: 2a6e72b3a13232251c1b08e3bc3c39691652cc28 SHA-256: b237575ee2d4e89fedc7124f1293f9ef65383175e32954874da245949ce61075
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall structure strongly indicate a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf306403c---36067903093.pdf In PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/eeae38062b51bdf014927dbfd205f99f/267284867.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jumaximunerofakifodarof.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607431f449aaa---sabonofazusepukenaxux.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/984887db8f3e01fe21f467f57f287724/87595260578.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a4c4d2e8c85ac8bf1203d8fdc84b974b/guwelifixip.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160991c5fdd150---sulipununubu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/tigijuziwolitazewe.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c506b03f3---57834757013.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/xawoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef15e97e17---48617575795.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/vafura.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb4e4f10f---dipipewe.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ebc0bbec---tepiki.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1d36134d---2674442146.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefaa73df1---45285527661.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/nelefijijepikufadam.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/33746091590.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/18238537495.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/90124940556.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/54f0ee54cee1f127497308edbb384f63/paruxupurofinunuvo.pdfIn PDF document text
    • https://renault-service.com/userfiles/xijelajonelizifimezosena.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/mg7uiugi2mjkm8cf6hfa84qlh6/93792844823.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2b9b069dbce321863559874b2a9fb9fe/xitijewesilopobadu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4680a274f6f2948e63767c297aa984a7/88955481876.pdfIn PDF document text
    • http://huiking.cn/uploads/file/140308574677.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/60737943614.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/kisemajupelebigewaxadijel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=developing+a+growth+mindset+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 16628 bytes
SHA-256: 6f4334f962c2804d81652905d61059d5d7003524b19fb8085481ef49140524f0
font_01_sfnt_off000133b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B9 11100 bytes
SHA-256: 124ac3b95a74f24ff9ff230f7fae6683bb76349b41098c1bf3f7e426a521a89d
font_02_sfnt_off00014d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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