Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fc6128b44b3735…

MALICIOUS

PDF

73.9 KB Created: 2021-10-01 07:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4eb7a502198d66587cd6f2305b0e4bcd SHA-1: 3f1c51d840ea1bda925b746480224f215c035f29 SHA-256: 90fc6128b44b3735a5623eb13e0069426376dbc74dca96f5cc1ca7fb3fa54dcf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users into downloading or accessing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://diamantina-joaillerie.com/ckfinder/userfiles/files/40983894185.pdf In PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/pobobinezifetunetug.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/19987606670.pdfIn PDF document text
    • http://cosyromania.com/media/file/37299065155.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/91077927595.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/mugorunenefodalela.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/83979925819.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/vaxosizilojopo.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/83950921974.pdfIn PDF document text
    • http://pmke.cz/pictures/files/wupelema.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420a61bf6c8---bevosuzirolugi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qfguin9t1k2m0g9fcunh04j682/neribasatugedogoga.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/83581457712.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d633ef95---67391591125.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16153049a6f62b---tizevuj.pdfIn PDF document text
    • http://favourtec.com/attachment/file/jezixa.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/40348460692.pdfIn PDF document text
    • https://everestart.com/images/stories/file/febunezekegud.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/47248350542.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/60441080357.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_052825.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/30360037689.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/nemevoboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=aol+instant+messenger+for+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_off0000b5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F8 10680 bytes
SHA-256: ccd2804af15d17873354ac4519f85f7a2e09a5388c1d47688faa9f1052173749
font_01_sfnt_off0000ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 19880 bytes
SHA-256: 60a4c55486ed0cf6708d70c264705139d2de357ed9d491f62615ca644a6d8ed5
font_02_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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