Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d2e6524ddb5d72…

MALICIOUS

PDF

78.9 KB Created: 2021-09-26 07:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f6e563473ff9358e00c73bcdf6d50a6c SHA-1: ad57623084c7a5b00174acf37c8c8d5c5e7548f7 SHA-256: f2d2e6524ddb5d721431ff8f91b646f9cfa4e208b4865e1344d3930a9ccab800
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://irlanc.ru/uplcv?utm_term=photo+collage+for+laptop+free+download PDF link annotation
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/45a518a8c98193b3fd3a849b68604745/mevizodosudaz.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/0ivmr2bnv45g0f6hs6jd3thl73/wilisipagejevos.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/86881001331.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/kodudupeselirim.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/mobulix.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/jofilijodulukaxi.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/49137205200.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dkbtpt07i7f6pg9j4snknddhse/fefemevegafiv.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/84126216976.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/balabetukafupipidavolapi.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/gelarolazobad.pdfIn PDF document text
    • http://parateam.cz/file/lofajegubebeniw.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/99007696169.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/jurigutovaxapuvadabu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5227c66dd---romezozunufa.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/tedes.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28970f4da---69343412561.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/titemigetereveresopalem.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/pozakazofug.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xanavupiforatavaderagitu.pdfIn PDF document text
    • http://office-tommy.com/images/file/35579296096.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/nomafixenubivasibu.pdfIn PDF document text
    • http://12333hy.com/admin/fckeditor_upfiles/file/2021092114331680554.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_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 10724 bytes
SHA-256: 97dcd590afc0983a6c9d0a21da010e22871495ea1e7b386890476d138cc71bd2
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 19892 bytes
SHA-256: 677857fcd73009c1c1592bd72f58f7388ca3d004df7df17d25e23b28d50101fb
font_02_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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