Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf51b664b27dfd3…

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 13:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bea7cb288d9ddf52831056257b915b3 SHA-1: 060d0ae5928628c863c5bdc5bd6c24a04e27f343 SHA-256: 5cf51b664b27dfd38b03a54f95922760dedbddbf9423b98aa7fdbe778915fe5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://prime42.ru/userfiles/files/91644490111.pdf In PDF document text
    • http://huthamcauquanggiap.com/upload/files/40405986290.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/16687352095.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/tumowurotefezof.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/45133838433.pdfIn PDF document text
    • http://kant21.com/userData/board/file/42956449937.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/66171649224.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/28053564919.pdfIn PDF document text
    • https://tch.lu/files/files/56613235247.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/41333425183.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/gewafeboboditelelepofose.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/wejatevunirumivikisokes.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fb29b188b06dc91f472af2fc2267f9a7/bepel.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/gewuguxetifirutelisuva.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/31274078674.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/20173473723.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/topubo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140695134fcb---2196278947.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/talixeburonafuf.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/99283479539.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7e83f83c---77930321722.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/pogozeliluvesu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s7tt6fbp4171t28url6cjl8et5/xetowowojimez.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161390800a8676---zoxopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=apps+similar+to+garageband+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_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10964 bytes
SHA-256: 1d0188d18813d3085616c807c63946d0047c2cdbc9833bb1e9e82fbbbf7f13ad
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 17624 bytes
SHA-256: 674aedde3f8a6b26e2d5e956689c3845259daaec479932fbd4e9565459611b14
font_02_sfnt_off000136fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.