Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf10712c0fda2b1…

MALICIOUS

PDF

95.2 KB Created: 2021-09-16 08:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32fc97422d1ab3709763a9496bea4c8f SHA-1: 5c8753348f8d8490dc53e7d6710184c7722e7a44 SHA-256: 0cf10712c0fda2b1ed4eff0bb6f6f1b8191daa8c20065fcda91390fba05166b7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF structure and numerous external links support its use as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://anael.fr/fckeditor/userfiles/file/11158379685.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/08c09ee6f21d674fadca681f30f49978/99891577889.pdf
    • http://jubileejec.com/userfiles/files/widobotuxukobexisemabiwo.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac9ae6aa7---daseretiviposuremawov.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/99687555605.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba954330eb---magosezorak.pdf
    • http://ncteonline.com/userfiles/file/zirowatobud.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/29136770848.pdf
    • https://brukspec.pl/upload/file/muzevojorakavutakaxikagoj.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5409c962374e46334bcb8d8a23e79218/54066454810.pdf
    • http://montazerangroup.com/uploader/file/64234725515.pdf
    • http://swatimishra.in/uploaded_files/userfiles/files/15670930281.pdf
    • http://orenprom.com/img/account/file/zovuxuvudobifuxozuj.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134920c998a0---nuzafovo.pdf
    • http://seamcc.com/UserFiles/files/75416370851.pdf
    • http://pilot-market.ru/new/files/file/49723578923.pdf
    • http://gartenbaukoeln.de/uploads/files/63141523193.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/71be12f1904bcfd994c2feffc7be3024/49789259967.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142c5a27e763---57731061209.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bizesolodazobozinar.pdf
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/3274914568.pdf
    • http://hamdannepal.com/userfiles/file/fizol.pdf
    • http://huseyindurmuslar.com/images_upload/files/nozete.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/542b5771c24dc08ffce0a63cdc49d0f1/51718819454.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/5430758695.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8a878de2---40572553764.pdf
    • https://pacientes.quiroser.com/UserFilesQUI/file/folaniluz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=new+bhojpuri+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011201.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 16792 bytes
font_01_sfnt_off00012a13.bin
5d2367b89698261289044e088350d475e3c903bf8727bdbfc9dcf726bb0bf8bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 17456 bytes
font_02_sfnt_off00015786.bin
62d2386dedc10c220e7eca5c171fc4fca2ca0057938e895f263cb0a065adced4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15786 10588 bytes