Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c741538ceb0fe37…

MALICIOUS

PDF

83.7 KB Created: 2021-07-21 22:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32c089eea4a4213da625fa64b85ca729 SHA-1: fb66afad7dd3934f310e9108345bf29b27b51449 SHA-256: 7c741538ceb0fe37b29d6f1c8689ccc75a8dfdba4a12a79c5bf0535e76680fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://tlxzkj.com/uploads/file/170450568432.pdf In PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/xejijuguvebomiz.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/junowunubowimo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/46891882426.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/poakcmeuc5l04vsjqs1f419qgb/81672515975.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/47121677137.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/toranategerusejafexux.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/59786251120.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ilp8h39rnm7jcvro58vp9eatkc/92408494330.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/96190885891.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b118d89ed---jorajumemimabijijev.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kgni5iac7u3rvt6km53mt0aj86/27601184675.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7a760c1689fcaa8e24092d955bc7c0a1/duvokela.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/kojelunibinugewipo.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/44748655314.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/21847121628.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4118292a22---94140470167.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9a531db9---kufonujodiwa.pdfIn PDF document text
    • http://www.bash.cl/media/file/80587925744.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xadefotasetogukopedem.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160989ba10b899---kepirubufenifabufadexeja.pdfIn PDF document text
    • http://kccmaul.com/files/files/rarulibuno.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///78160410299.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zujet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=poisson+distribution+calculator+with+stepsPDF 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_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 10936 bytes
SHA-256: be8bea45a5089ab0733758f06d45cfadd9db2e213d7a9b611e425dba4a4fe753
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 17532 bytes
SHA-256: 8619c7266b1bb24598e667b13e79335ea63396deef312262aa20343b35361f41

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