Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28b096bbd80c786…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 12:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bdc7b20dc0847d32adb56ddd1bf1256 SHA-1: e9081a183c1e6999b946d2ed9fa419c9c5420609 SHA-256: f28b096bbd80c7863fc16ed11816cc2e62384924bf325647d7d21475cde38500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The embedded URLs and link farm structure suggest an intent to redirect users to potentially malicious external sites. Although no scripts were explicitly extracted, the nature of PDF malware often involves exploiting vulnerabilities or embedding malicious JavaScript to achieve its objectives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=mario+advance+2+cheats PDF link annotation
    • http://wiskind.com/filespath/files/20210903150901.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/wetakosizimosuzaxezepa.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/19549206470.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/6026659502.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kukizekebaterasirekux.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/62079688299.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/18775633441.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/55050337241.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/mizomejujaniv.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/jeget.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ef64060c2---judenutisu.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tukokifekelafamosirujofo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139898228fc3---95693098973.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/tesuniligibunovos.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/rabixunibefuwikenojebuvo.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/raxulo.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/woseterituwukiruxisi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614068786ac14---32875323356.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/89583669931.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/79436764184.pdfIn PDF document text
    • http://iccarrentals.com/files/file/67726668415.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc86ce6a4---tajedasixinazufese.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_off0000b867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 10600 bytes
SHA-256: 22a463325bfc785423acfd5d2260f7065556a445f89f902afe1249251154386c
font_01_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 16076 bytes
SHA-256: a1dcc73cb0d2e7cbcd2ec6ecd9629d1dbc1c1970f579b858b1d9b7f52985569a

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