Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cbfb56db43b07d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 14:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d99ad38d6c19fb82ba10447880c0f490 SHA-1: b37bd2de6c5ee027e22221ad8541aa27bc6e08d8 SHA-256: d0cbfb56db43b07dd3081711d7274a0b07eb493916c5ce591915cc831bcdde0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the document as a lure to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://thefertilizergranulator.com/d/files/lasexif.pdf In PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/vifiwupuxavupiwesevebo.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/pisut.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/92249695174.pdfIn PDF document text
    • http://umhouses.com/uploads/files/nuvex.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109010314533854.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/c20aaef277f7c4aeecc79b92904c5edd/9923000630.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/xatovabiligimaj.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910173815990196.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304d4d39d2a---fivuzusibatovofefetopag.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910095233.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5f137c7a337c1465748bbcfd4a86fb5f/detatuwagikaroseduwimamo.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-04-07-08-49-ASw1sUTr.pdfIn PDF document text
    • http://dasbluemchen.com/pijokugizonuwusofap.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/lowidexevujok.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614530deb24ee---xumebipafek.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/mumewozevenofojumilojat.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210910_7B0C1798C715239E.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/14680655969.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/dinefalisa.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210914112015.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/mamime.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/sidufudexevajokulorota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=connect+bluetooth+mouse+to+android+phonePDF 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_off0000b085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB085 14784 bytes
SHA-256: 8b9a9c2fa840250ad0e53ee3a5808c9f09670a38b11acc400a84b03c51792721
font_01_sfnt_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 11048 bytes
SHA-256: f9110c221187229cad7d72f40590d849017eeb65f1d435a7e27186c7699b88d0

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