Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fcedc32e071027…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 09:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40de9a1a680c0a78ef2b35a79218c0a4 SHA-1: 6f275ba88cda0c2fb2673701aa55bc115d73be40 SHA-256: d0fcedc32e07102763b5097775dbc0c8eeb4d29b0238b7e7629dda6101451af9
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to external sites, some hosted on compromised CMS uploads or disposable domains. The primary goal appears to be directing users to malicious content or further stages of an attack through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nt-module.ru/ckfinder/userfiles/files/menanifanulamisez.pdf In PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/37324600944.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/zagafarojidiwugawejukod.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3cd307716bb88ad18303a91fcff0159d/82015693006.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1c1ec617d---54219117780.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607373e1264dc---27913917760.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f797936b---40242006557.pdfIn PDF document text
    • http://cissi.it/userfiles/files/vosip.pdfIn PDF document text
    • https://quizai.com/uploads/files/30525354976.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/delozamodoku.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/35483951583.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d3727f3ef453b78cc5422602fc3f1bbc/xuburir.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/168d7228c1e14906f522a3fa31298888/lokun.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885c51c75f6---79162459776.pdfIn PDF document text
    • http://446888.top/userfiles/file/17041694043.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/xosijaponujaz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a69c9a2a---jidatowilezenativekoxiwav.pdfIn PDF document text
    • https://castel.ro/userfiles/file/34019919608.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f07c44a5680aafa52dcd96d78779802b/64090178151.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/banofog.pdfIn PDF document text
    • http://web68s.com/upload/files/toloduposilidobolapep.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/tojifoxezotakax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+simple+implementation+guide+to+robotic+process+automation+%28rpa%29+pdfPDF 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_off0000bd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3C 11424 bytes
SHA-256: 0b253db881a50650a077b741f568a89e6c899703a9aafd66e5d4be3803754db0
font_01_sfnt_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 17360 bytes
SHA-256: fa5262337ff444a115f0b59a80f4a31237e64c454221f8f82ef49dd9aef5626e

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