Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cac92bc8144537…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 05:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dee96f1331381e5626d46b0aabcb882e SHA-1: b4357275ab42992d0732617329e2193adf8d49a0 SHA-256: 19cac92bc81445372886a76f7be75b2cf104a532562d21a0761ace5bcda0fafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on potentially disposable or compromised domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its numerous URLs suggest it's intended to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://galluccifaibano.it/userfiles/file/jesefidewujabasofevu.pdf In PDF document text
    • http://slhospital.com/upload/fckeditor/file/23327958499.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c76eb1710---2857378815.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/39754752024.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/50812205340.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71a42f9c0---27234310919.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/mezodogitevijojubogeza.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/52872449137.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/71239411800.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/264e3f5bb2a4c0c98f40c7923f09dbe8/vutekepukutonuke.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/36706527088.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/16860931358.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7272fdcad8727b2bf8bed45c31005c02/judizekagixegusupi.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/1608766436.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gekobepopexexofibupe.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f285d0ba20---68296741497.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/tepupoloziboja.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e163b7e746---87087893808.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7500c0644e---47100857547.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/71c0924e91009249d95bc9efec9d3945/13108700166.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8534768bde78de1a01c8380fd998e233/kovoxadufejosujuxadol.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/5078778415.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qbfgbeo0k9jnm4j48sf6ufj2f5/76893394156.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc24aea856---xefekolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bank+management+textbooks+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_off0000baff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFF 10988 bytes
SHA-256: 5aba1200e27a675677dd3ab90a343279aff730a4ded7ba40aed9318e88c1b4ed
font_01_sfnt_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 15740 bytes
SHA-256: a329083278cdcf529ad56bd37dd256ebabc2614167915e46fec842c76fbe9b8c