Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff730bfb6ce91e29…

MALICIOUS

PDF

107.9 KB Created: 2021-09-07 15:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b340e20e9aab4eafbd667cc069327ef3 SHA-1: fc91375e04278f9e8094197618d1ade7b9351e01 SHA-256: ff730bfb6ce91e294607a6d3a525333d4c707e676208c53003c12c22afc0d6cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kn4bscm5p2ree3krgutrfgfvng/janabavipipaxowunate.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/27848499044.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/2f3a7271fd1d287d8246171df9ccf9d4/lugowadupa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160819cc60266b---padolatezomanunobe.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/vuwifugi.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e3f9ab79d2e57ff3cfe3e0cc39189c32/61632516630.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716e3d2e077---25659703059.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9394ea56e---65531153449.pdfIn PDF document text
    • http://fygl.net/uploads/file/050437381868.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/15792553100.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/2984340051.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/lexotigewuwotavosebos.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/42306446143.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/22681456242.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/j2bgcrpactrlcaciqdr0ceoi6f/jidiraferupugobe.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d568dec60---56710108339.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/komeza.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/posijajusiwe.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8fe66759d4ec5aaf0b8b23fddbd6e010/49429634173.pdfIn PDF document text
    • http://rayanchem.com/d/files/61901235351.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l9tos41e6i002duj5eohmf7l72/47912691311.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d335f8693c---nanajibe.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffa3760a4---51269874906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=function+of+brushes+in+dc+motor+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_off00013d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2B 10896 bytes
SHA-256: 92b2953d2f167b93f7b3bde943220042c7486aa4931c5c96e04ff5c5cbf308c2
font_01_sfnt_off000155f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E06 19884 bytes
SHA-256: fb9da1a283e8485a6facbaae8f8c8e8b5c143a9f565c6a1c10844198bb0ee935

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