Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8597504280ed85a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 10:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb7ffbc208c50d82ce29feaacdbbcab5 SHA-1: f2b9633264ee3fbdeefa904ee40a6a17358f23f0 SHA-256: f8597504280ed85acc0e735ca2d4a7f5981f524a451e7b493b3d19e28551babe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ubitanduk.com/contents/files/32638103189.pdf In PDF document text
    • http://youzedu.com/ckimages/files/20210921211551364331.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/96279251751.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/tobisisopijinabojix.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/63320108341.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/pisekewumajulo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e10d0e35b1---kanojevogisi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/telewubemarefumewuwakuses.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/valoxutodebidaweb.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/94184340354.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/13134728320.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/logoromanamuf.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/xegevivejoronazelerur.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/63538580536.pdfIn PDF document text
    • https://solturism.ro/images/file/59591944299.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/67867515195.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/musomirowise.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/90305997556.pdfIn PDF document text
    • http://chayka-svg.ru/files/wetonebagunapowos.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/goginegeranerimolew.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1283376a---gajevu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/0c3ef11d365bf112d44d94ac8b475fbd/vosewumubuwibaziboz.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/veburuserowupaxapumimapo.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/49569105872.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa1c262cf---dajelukusub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sultan+full+movie+hd+onlinePDF 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_off0000b5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BD 10592 bytes
SHA-256: beec46b5b0211c0586503609595f336482367101391acd0c5f73719dff87cebd
font_01_sfnt_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 16712 bytes
SHA-256: 159427800d0ca4e67af2a4cba0d24db5646ae441dfc4b266d2e14b3bb958fc53
font_02_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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