Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd03bd096a3ecd7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 19:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca6ed1e2c7ffb3c78721a98dc3f7d01b SHA-1: c5912ca6df48b48161931d2d12d3214a47cb8e3c SHA-256: 5cd03bd096a3ecd78cdd4eb8307a7b3c7223317f32b3f423b7ef230e6d57ad1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised websites hosting further PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kurumakaitori-one.com/js/upload/files/samikogoro.pdf In PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/24977833000.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/62410922193.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/sukamonirol.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/197630e4e5801659d9ecf45b80d55d60/91622191541.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee3b44d5a---53933883042.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/69305024261.pdfIn PDF document text
    • http://aa-nusd.jp/jatakosetarele.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/12729217629.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/pujomapopegoxox.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/zajajoke.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/cgop4221vp2p93cpn2u82id43j/tosezek.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210910035928.pdfIn PDF document text
    • https://cncunse.com/d/files/ranawaromovunididi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613345ae1fada---97896144876.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/bopumivil.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://ncdesign.it/userfiles/files/78149366733.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131af3eecf4a---saliwibolafurepavuped.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/88883863997.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d87e2a9911---goxenuzobeja.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/4625551482.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/31039673742.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/37239983803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=elder+scrolls+morrowind+androidPDF 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_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 10500 bytes
SHA-256: 169bc4b4e5390c4fddd40b2b4f35a3d0f11c0663960715154152c55345d3dc95
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 19536 bytes
SHA-256: 0d3d78c619d8cbd162aa64c701411091e1f28291f6aa93e098609b79c3f59a6e

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