Malicious PDF — malware analysis report

Static analysis result for SHA-256 362967be1fc0decd…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 23:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 188f2a6c0695891eeb4240d96229c826 SHA-1: 7dbb3411f2a6f7ee44d6b845c9aeca7a5b32a351 SHA-256: 362967be1fc0decd3edddf24b02389915d8b32a8b4dd99e97eeff30c76c5f7b1
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=ding+a+ling+the+christmas+bell+conway+twitty PDF link annotation
    • https://sinarwaja.com/account/files/62410310068.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/mefitibibozirajejujisar.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/jamokifuvipuninegitemonu.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/8052648193.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/08faa2f6d533547a660f9ff593b47221/vusalipunolapidubigapod.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/011485d8015a1c7ef760a0f9a230a4b2/jogaturidibob.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/besarovemokisumek.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/sasolafarala.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/donuladolodazipinukelal.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lfeui1gs0nrvmu2bn1phoi53pv/zazuvozaxumawa.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8afd317183---buzajijetawozopejad.pdfIn PDF document text
    • https://esz.jp/img/editor/files/vepomo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ccb9ab642---sujoledogipibalivakugow.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/19769443907.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/nufaxax.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210616225627.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/91642684501.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa13662fb---zodizoduneb.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fd3606bc---29491305663.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021073112205773499.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/mozafe.pdfIn PDF document text
    • http://pb-book.com/user_file/file/91519706945.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f960471fadd---88164402659.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/13239438988.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/vezodijefugumaj.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_off0000cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 18288 bytes
SHA-256: 2abb9eb0c1860b7cb5737b9faee7b57f8dee06734fb40851f6d7b718cdb7e083
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 11016 bytes
SHA-256: c03e0a419ca25f4117f2c05cd6b7e03d2df5a522c05b7b8efda69eeea0acb290
font_02_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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