Malicious PDF — malware analysis report

Static analysis result for SHA-256 602ff4e1123aa827…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 05:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32c8c5d4830764a6686df526b82f8720 SHA-1: fec97235339a7e6b61a4057fdf5e2c7e34099cf9 SHA-256: 602ff4e1123aa82752bcfbfb25b1d32e04634f39c31190486e4e4152f75ecab6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, pointing to compromised WordPress upload storage and disposable hosting sites. The embedded URLs likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://coretry.ru/uplcv?utm_term=parrot+disco+fpv+user+manual PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5d3d9e006---15279993449.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/62981107532.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160748a246ad93---90491731063.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/lugikesub.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/wogeboduda.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/37504174893.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/kuvosuwe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a5e58b2a6---67446661498.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/pidaxodomedatililiva.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49fb74edfd---mevuxasezadi.pdfIn PDF document text
    • http://airsoft1.ro/files/file/50917858217.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/npsspago4i1rqs2gav873ust3m/9160133571.pdfIn PDF document text
    • http://vizcsap.hu/files/file/76168301373.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-1/20210701164709367829.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vfqd7shn7b3i2gqgh45d87c3c7/vusamilukarazetufabuxed.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i9sb03tlnplv9qu56mu6gbbc95/71893368788.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/50365d5441fa76c458ab69c3f3221747/silasu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/04d7a1b8a0397244b042b30635f678ab/27921656294.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/woxujo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0207e86aeb---gozedokokodefalinisa.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/defagarobemafafali.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/wojuve.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/misiwigemuzozonaxidilemuw.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/mexuj.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/92c64d09a365ad223f13cc64f1c7766a/xupijotivov.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f57dd798---roburorarevopexoxuralu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qioviphnc4ihtp9378gvfgruu1/ponifijoxofafuworitejuk.pdfIn PDF document text
    • 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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 10948 bytes
SHA-256: 715f1ae61b22f7a2b92a90d2b9b5dd8a0617a841ff6cb9a29b6b5bdbeb5bfb46
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 17720 bytes
SHA-256: 906f3a899370dd0010b33c4aa373561641d4381846bd23ed5cca4dbcb8f0134f

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