Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bae57e3124a059…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 09:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1a8d3cb683730c3372732bf809b48f4 SHA-1: 9b0233d03999312777730231ebf13580f16c6bff SHA-256: 32bae57e3124a05983d7b7796e1c78ba6d1f1dd15c91397398aeb9991d0f5cf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to compromised WordPress upload directories and disposable hosting, likely to lure victims into downloading further malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://clearspace-design.com/CKEdit/upload/files/52144609164.pdf In PDF document text
    • https://tempegaring.com/contents/files/15757899482.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/tijapaduwewe.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/doker.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/zekusobedemeg.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/9913577796.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d70b7e1c---jukomosiveveja.pdfIn PDF document text
    • http://bscartridge.com/pic/vizudabepoxanebe.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/rujixofakesomovitosat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc85481fcc---kalidupezatelapoker.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/ziximobikegi.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/xazowozoxiwewalaz.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140632bc5497---82470439297.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/mevul.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/tuneb.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/jakobitikemuponuwak.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/kejeforanatasutokol.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/badelutimisawojonogag.pdfIn PDF document text
    • https://best-label.com/upload/files/didogakuzirijefafobuxil.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416729461ba---nagititofuwal.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/84301306298.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/80748938348.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/semopinogigupesolutu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161413d188bd77---63435753190.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7551b3371fcea3a9b84db59cdb0732ea/voxelab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=context+menu+example+in+androidPDF 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_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 10620 bytes
SHA-256: 04e49cda185f55bd7dc815244370202a43c199a65c879fb6d797db1fc17a853d
font_01_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 16828 bytes
SHA-256: 9dd225a6d44c8fee62f16d82cd7bbb53c4463b4533738d78973ef0898d91f4f8
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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