Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ebe250da698b06…

MALICIOUS

PDF

76.7 KB Created: 2021-10-07 12:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b5e9b2b1501f660b5ba022d3c125690 SHA-1: 11f9846d9c0291c7711aac3ab9c6eedfb2fd00b8 SHA-256: 72ebe250da698b06455407d0b0c5e1ddc37e31ec0d2874ccff867f8435b86875
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/turufololetur.pdf In PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///54592567234.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/tileniwefakugadifuju.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ede0b3f4e---20703279370.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/65205286518.pdfIn PDF document text
    • https://eclearusa.com/images/file/vubosibonulumasodu.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/xexoruzigikazomapis.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/nidamumodakuso.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/92043005399.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/30740248066.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lofevob.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/zuxiwewowujavi.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/puxetusepiguputige.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161561198c7a95---79997669004.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec533b7588---31651556747.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/mujusodewazozepuwutu.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/duzaxopirat.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143cdb1a16a6---55819234376.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pusotobavavukazekut.pdfIn PDF document text
    • http://indexone.ru/upload/file/fijudakupob.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/62670818749.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130612942994---91747569058.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8db9b20b4---67440237482.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/70668814532.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0dfe020fd70586ceedb50a3e723cd1eb/lubozajozetek.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021092165236_83185946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=insertion+of+the+pectoralis+majorPDF 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_off0000ca53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 16552 bytes
SHA-256: eb0765a7d2cff8fcca95f24033362645e73adb194b423bc92596b471e88d1e39
font_01_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 10828 bytes
SHA-256: 4e7cd9d1ca0188bb3823ecf3ecd790062213f7304af7ad0fb5b06b08cab115ff
font_02_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1