Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6d2089fbd7f052…

MALICIOUS

PDF

98.9 KB Created: 2021-08-14 00:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8da8d45b2c96ab249441990e92c3a10 SHA-1: 63c65ed929b8048e0a39a400fa21e897e96d1f0c SHA-256: 9c6d2089fbd7f052ce14887b078421061d14fa6c0489d4955129149e8e75f14d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is also flagged for suspicious object definitions, and the presence of embedded JavaScript further supports its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://dok-vo.ru/userfiles/file/23823881360.pdf In PDF document text
    • http://hondatayho.vn/images/ckeditor/files/nodefazasagebimujogowekop.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/jusajufokukapum.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/bewatolamolekasikib.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/16760674242.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/40894195906.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160975bd2df1f5---vetibun.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/miruxepiruviwafimupul.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/lizex.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/safifemuletesiroveb.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/bhg9e9p6drvfvf849mhb4u5rg2/11594972081.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d921d861b40---pigarexanebawutunez.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zunulitawunejarunuteb.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/fdd839f67d040fe230cde473a7f8d4fd/fikazolexaperiwil.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/gevuvumafafarasomob.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/43164515551.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c5aa60ff---95002962644.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/35220503212.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cf0e730b47a9a78b5310918726aec08/55381351130.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/vukekepes.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/fagigilovinanofalevumew.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210723124938_3eijfm.pdfIn PDF document text
    • http://hak-al.com/resimler/files/gulukimovixojenukulelaz.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dcdf15078---96848157487.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/jamubufuroxonudikoxaku.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff066b232---41430907855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+practices+for+equity+research+analyst+%E2%80%93+james+valentinePDF 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_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 17536 bytes
SHA-256: aad8ec135c90fca99cd2f49f0d754c051447590be3d609f8e00c1c812367fb82
font_02_sfnt_off00015f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5F 11384 bytes
SHA-256: 781669fa784ceac4a8fae702b4d65ea196d31349259defc0313266aac14af3f5