Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f6ad2ab3f8c9b5…

MALICIOUS

PDF

91.5 KB Created: 2021-06-06 22:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 17c8b8a7cd28bfda209326941b42a3c7 SHA-1: 3922e76240d0c45b6a465e16ed6b0d9ba795464e SHA-256: 04f6ad2ab3f8c9b5624cf15c3ac6d8f6bff2e570cd42239f07107b82fed451e4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing campaign. The presence of ClamAV detection and ML classification as malicious further supports its harmful nature. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=cambridge+igcse+and+o+level+business+studies+5th+edition+textbook+answers PDF link annotation
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4bubgnvnckbkh25p7gt394h815/11177159366.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/luranawinixuja.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec79de5819---37492717980.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff734b68ba---77970391224.pdfPDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b042c8e68f7---72654323884.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e30fe8f14448cc41add5eace61c2eac8/mulosedumovagarasujobako.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089fc76053ae---98289877741.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb23cc9e4e---nesakumukimuso.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/fojovomuwo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e4808f95d7c0ecb6b8e1f58b5784ed9b/xupesenodofafoku.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/kidatikeselis.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/biritaxuvizugebeditum.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ed2152fd---katinedo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/310433e07225abd189af6ca728583a8d/gosawage.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zidirakuxusutuw.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9c7db391fc4b1e115b71bea009b438c6/7086963487.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/zesanumenek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 5808 bytes
SHA-256: ceec08e7140fa62c4c28dc16237a005d87c88f652f432ec1bd0763b602b69f3e
font_01_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 14400 bytes
SHA-256: 8a96e5b3f789477a85687b426fba3930123bb8151e0b6c5eaef1191fbae079fd
font_02_sfnt_off00014b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B61 16064 bytes
SHA-256: 51e2beade88488dee32ed4fc2c4484d47517ea4effa5d8717f4d02e2bafffe1f

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