Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b18f4ce9eb7a4c…

MALICIOUS

PDF

82.7 KB Created: 2021-07-22 08:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 247ef6fee1f076a7c601e4aa463c7319 SHA-1: 00e838efaf4eeded17e469ea00d1837dd228ae8c SHA-256: 90b18f4ce9eb7a4cbb0f117107961556083f33d2b63c54530e911612cad6a88a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2r6mcm4u1ddilra3l6gn0euli7/wemiw.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a4c49066810f4703fe20106efba14882/39612002581.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f50dbb39d0e---mixez.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/momowigomidakeviwugemowi.pdfIn PDF document text
    • http://scro.ru/pic/file/gevikizavajidokubutos.pdfIn PDF document text
    • http://capital96.com/userfiles/file/86840137092.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/gemesakugur.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/6074358021.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e22da2e90fb1580eeb9a642a42a47a7f/74983214980.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/23f9cc5f7d6b3e99d0013f0f6244dce9/gegesetefirimamuguzadoxo.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/nejodigemewofi.pdfIn PDF document text
    • https://foreningenflex.se/anvandarbilder/173/files/vewijixuri.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/19581435986.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c88eb1a9517---wururu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763bbb9e719---42104770444.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/jopovikevu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a053d2fe---kudajejiwime.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/milizadab.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f72cae22---41609464099.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/mafijeza.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a237edd4bd---99947506235.pdfIn PDF document text
    • http://hanleyresources.com/images/rejitofopuf.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e12e01bf1---degebiwotipupar.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a60b647e---30487824082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=waves+notes+physicsPDF 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_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 10496 bytes
SHA-256: 960894ea1f5a2f016d6d1e9d0e42b30133f5c3c409dd49f8c1daa8e775d2976c
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 17844 bytes
SHA-256: 469c49fc65f70c6c752fb51a8b925c524e997dc03b60e620161998c7e3899c37

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