Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6d142951c6452b…

MALICIOUS

PDF

100.5 KB Created: 2021-07-14 09:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cd02fbee4d06fcda41aaa2b63078ceb0 SHA-1: f51ade0068fc0f5689285132306a186690d711b1 SHA-256: ff6d142951c6452b9537af5526801a58fe29a04bb8f3431c959c402c8b131a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through phishing or malware distribution, aligning with the Spearphishing Attachment and Malicious Link MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca639cb666---97146458479.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1c26fba475aed71988892aa7440f1a9d/dagulisek.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wenarovebuzeto.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/jejofonazepukek.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/18i785oin0qul9db3k4gslevk4/99666558210.pdfIn PDF document text
    • http://charivne.info/images/file/penurafunasawimebapo.pdfIn PDF document text
    • http://absigorta.come/file/suwigolesenovodut.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7a16908567bdfa61f0b6c8b50fe6f592/jinawokivomagegibujigu.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/nolixaruzosejulokilanin.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/bf78cree7jkf5hvvudb489b2id/65233377713.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076674c03ecb---jimivesizojobugowejo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2f0af3af---926784931.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/zuzuzaxodes.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4999e1d8d---87642507695.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2f0690951a8cf57f3b4c1b8e84576d5a/filaranitiv.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/mitato.pdfIn PDF document text
    • https://led7.ru/file/60636175400.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/98684397763.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/salisokilategu.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/43007048042.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8f19f91f03cc58b5611f1722e6385454/92528964218.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/99804125472.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e66f24b405c220fcafa406f60727708f/45906253524.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a34b1b7a1ada7eeb4eee55f29f2ac5ce/luwutulolofeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=example+of+a+website+titlePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/01433efb96cbe437068faea9d996f4e5/72421970153.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_off000124f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F3 18168 bytes
SHA-256: 25f6134ec07457b789a84ef5b064873ff6301e8c0f16f6e681c7bc994980a896
font_01_sfnt_off00015473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8A 10628 bytes
SHA-256: fbc84123ae3cf7c6d99917a92f1c8e0e8ad1dfadc8b2abc925b692dcdfd39c7f