Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e1d2b091e8e261…

MALICIOUS

PDF

88.1 KB Created: 2021-06-25 22:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 49a8ec460ea186e613f6919f18c9f3a3 SHA-1: 23ab1c3c4c8b8ddc99b144d6e8c323cfd8dbd8d2 SHA-256: 88e1d2b091e8e261740f6a36f19f05f6855d7a3573028de864af685b93e2915d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0fa4b8723743e79b440e7d8747e413f4/miselikasaxenipidot.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e81e2db6f4a45bf620b56b2c64be1838/67238234540.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160704a94f3cc4---wagisodipimafojaviraz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/isetbmqmr1hqe0ka6623vsmqpo/romabugamimezitofarep.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210513171256.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837031cdc92---14172234321.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1ed309bc---fagideleromu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a3cab6b69---menuletifomirivebir.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060615032222.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087248bc6c38---5163113039.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nkjohm2pfgkbh29f55t1me5j9b/87817087099.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d3f9cf9f---64061457109.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fa622dae4ad157197d1ee3b58223b386/dafiwipidawumujoparuku.pdfIn PDF document text
    • http://vce34.ru/attachments/file/84004592689.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086058c15f27---zedatodarevuxus.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/jugaguwukepuduweti.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af3f82bda8---dorejefekipipuxipun.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/mikawe.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a5f6facf0bfd805e64e613bb2d3de549/pororojelovo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/l32vu7ct9t98mpnc52eqs426q1/96240257899.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f3a812fa---95684407619.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m664rjldtfkvl3te9l2iip0oji/vazatoxexo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/enljvvajgtava9p2a15dbeth62/38218715196.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/gefodafiwabaxabifufiwa.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/373a4da9dff19ed2fc4b4e967ed1a126/93747626488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=army+of+wormsPDF 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_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 18500 bytes
SHA-256: 093d6b9f64f14e6a6fe8626bb2de3c6944597a1a0c407fd3a91d139d4cab860e
font_01_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 9924 bytes
SHA-256: e8ce53c5b1aa4fd689b7bf30b9a866744a6d1562e4cfebf909d695c19a1d7e05
font_02_sfnt_off00013b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1