Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1d5e39584e80ba…

MALICIOUS

PDF

286.1 KB Created: 2021-07-02 18:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d3b1911e7a575f84ea622e7fbcb3895 SHA-1: 6230717af3c2d2efb88738386fc7357e5e72b550 SHA-256: fa1d5e39584e80bab9809cd179fca2868e362cd89c201c5e4eaae11002ad78c1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a link farm pointing to compromised CMS upload storage suggests an attempt to host malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the nature of the detected threats and the embedded URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9118

Heuristics 5

  • 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.
  • 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://denki-shonan.com/uploadsfile/renususofizonajixeridijel.pdf In PDF document text
    • http://stolizstekla.ru/userfiles/file/8477186944.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/digevivupaniwubege.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/83765738695.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/136233bdb6874ac81536b75053f5d0ee/66709563066.pdfIn PDF document text
    • http://sun-tes.ru/files/file/86347874602.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/bp35vlls01octec11eakqj9odi/lasonu.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/dasubemigide.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e29b59f976---vawidakagadurapividosax.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/h97vmgkcol80qrdcfii4d6ur54/sizalufiladololikuvu.pdfIn PDF document text
    • https://fallsplat.se/file/wadekefor.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/d31ej0qe9dga6tpih5blr9agg6/96286983605.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rotofumumelop.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/b31a5d02ae713e1ec19f5df11b4cd56b/77515169491.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5ede092b---17260693914.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/32c7a8133217cb501517bea40c07e9de/92562665624.pdfIn PDF document text
    • http://ibb-online.ru/f/file/19567968134.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02c90cdf9---83325966363.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/bufesidemevuroluko.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gumoluvena.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/10462750694.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e89be752fd29df41d9c7deac0d58cbad/47386626458.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/zukepopomozov.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/wijobobugugu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3d57d40f---48178673511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sterically+hindered+aminesPDF 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_off00040d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40D44 10704 bytes
SHA-256: 71896880999a03f6c3d2af1eae293bf42eecaa3c415828eeea3f50ae41a421ff
font_01_sfnt_off00042599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42599 17436 bytes
SHA-256: ae5b98b423c1b939d39e74901ff5f5eb3851073ed18f025e7fbb9f702fca8b18
font_02_sfnt_off00045342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1