Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad83418b7c3daa3e…

MALICIOUS

PDF

68.4 KB Created: 2021-06-11 01:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 40d5adcbed8f3030f3293abfabdac58a SHA-1: db35d00ed1da648484fc6c3bc7528f93342feed5 SHA-256: ad83418b7c3daa3ef6ff7194e7dc8f18c66137d6fbf475b5d03c3e52a85e924e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to technical documents, likely to trick users into clicking the malicious links. No scripts were extracted, but the presence of multiple external links indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://irlanc.ru/uplcv?utm_term=design+of+reinforced+concrete+7th+edition+solution+manual+pdf PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/40fe31459426bb0240cdafdd7bd73f3a/wixemasiwudi.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/duzituf.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098792420a61---dipizejorusabamuluxezujuv.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8838bdbac---17534640980.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0e5ddca51e89a7b21f87430bd7e8ed8d/39759374786.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/84a5c2fbf3094daed55a4f1f15a8da06/dumanawarojolakikazot.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/nawasak.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/508edcd9799bd49530413f325069768d/koduvotosad.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/9a007e5be0b88de098947d2f2ce75ad2/zajenobupa.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/p144oq5o9rbagm0bm7v52tab36/rubokufi.pdfIn PDF document text
    • http://temple.mo/userfiles/file/kimuziweripodefo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47d26e98b---zitaniwiwobejeka.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/vatomunujifegisaju.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/pfju558bj9fvbtvl5rlpp36cil/bupigifixu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/c13aq7o953j6o1g3ikh6s6ir71/zukokirusopex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B3 3176 bytes
SHA-256: c99f8783e4c4a2641cddc3197f55f0624cc0b2664dc613f5b99b29f643c13921
font_01_sfnt_off0000ce08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 5648 bytes
SHA-256: 4f5bc603196f1c152279b3a6e149ab778a17bc5b8c89d08f3ebd0af0244cc026
font_02_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 10108 bytes
SHA-256: d7d60df3c4e6508de8fbedaefe6f6314cf7485b7c12374dc341eab8d9c205521