Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d97d3e8e052a5bf…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 09:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b16d447042764c01518fc54d2dd4b880 SHA-1: c6771e59b08cf77ebba270e43652c08fa1781ece SHA-256: 3d97d3e8e052a5bf22a3272a5a82a64d5e57c8b72d89ac396b01203384fc0c41
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm indicates an attempt to lead the user to a potentially harmful site, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=onclicklistener+in+kotlin PDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613702d696cff---pokinides.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/26457020992.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-7/20210907222113810274.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/sitaromekilu.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/40268522673.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/s4qc7sk6r4cla5ncimk3g0nsrr/53805446062.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/fomufaje.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/39134004374.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/petiga.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/nadisametoxudu.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/metizidozosugip.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3d2788c1d80c3a5d138df77a2d7292a8/32775774195.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/7497148680.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/noxumuguvofabu.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/60970272628.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/11149512234.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-11/20210911221026803364.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/kemosisoruja.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/ragusimija.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/zuwun.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/winuzeloruli.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kesatogumuv.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61424fdbaee6a.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/xajasawarikaxugaluxuxedar.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/46989870271.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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 20204 bytes
SHA-256: 59516bab00d30ede85be817f75fb699710344707b07f7c26c1e81abff822998e
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 10176 bytes
SHA-256: e3e4855c17c1ced06e2123ebde6f4bc9624959be04697c44ebc8544fb0808ccc
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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