Malicious PDF — malware analysis report

Static analysis result for SHA-256 e841a1afd28f1b49…

MALICIOUS

PDF

293.2 KB Created: 2021-06-25 02:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9a8ba9feea02f7e76628047450163db6 SHA-1: ffc3d22839b1cded66d4e80e4810a88f9fd0bacd SHA-256: e841a1afd28f1b490948512f972fd5342fbbe5d99d21649d201f8d453a750f0a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c817e7e992433e063bec0db174b45cba/13333979401.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3de9c5bc---3561489178.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6959bba7---towuxuvumep.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k7fjjm8sge5u95ljcoutgu092h/24067663843.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a06dab73b---80030225800.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb7fb0502---turetatufiwazidilataxukid.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/11659567067.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/23549638945.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ad1e03d3cfd7bc26c0a6555bd41f587f/76707395050.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/925bbd140d3a93dc5d406a3ea74c3b46/60652279500.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/42165100247.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a27a3389f4e---kinegilizerepedi.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/juwosuwutolusulirurin.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nbqj2c54c4un6rb3o3nq2j9qjs/limubefixaziriluve.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a08732e86---57814037027.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5f920e025f090a4384d81187ceae3d04/pimabegagojuwanoriwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+avengers+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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f5b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF5B2 285796 bytes
SHA-256: 5a39373a993906c7bbca1ea70ac9ccde93650e24b449f1cc1f4d5e3a87909c68
font_01_sfnt_off000436b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x436B4 5280 bytes
SHA-256: e6eae5a9754356d1fb7cd51fd27dd0d0609a1441a860461d5be8fa67f66429ea
font_02_sfnt_off000448ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x448AE 11108 bytes
SHA-256: c6b7a64e787f8be5aba445448f69523d454a2325cdbf2c68a4478c81bca4995b
font_03_sfnt_off00046ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46ED7 17980 bytes
SHA-256: 474449f65404a1600837ad0bf7c51c845520b8e0ad7760d90e4e190dc439e33a