Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5dcebe5f231efc…

MALICIOUS

PDF

74.7 KB Created: 2021-06-19 08:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2ed7d46a0e8ad53a9f8f0d2235b588a8 SHA-1: 0cdc13c25eb7ccd4990a78cb67cd427f377fe79e SHA-256: ff5dcebe5f231efc1ecb38c52c6a06aad5a5ef02b8bac2ed50a70083125d7482
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

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 hosted on potentially compromised or disposable domains, suggesting it's designed to redirect users to malicious content. The presence of multiple PDF links pointing to WordPress upload directories further supports this. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

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 http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9488b5bbb---78903245979.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644c017704---rumob.pdfIn PDF document text
    • http://geotersrl.it/file/tukewixumuvutemuzutut.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/54102847029.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/81438256723.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ejj1dphu3j5glt0ue5i1qdkc1n/66996143132.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/64079207212.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/65252088803.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609e634360017---tazeziteladofaremege.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e39fe3f24e04786ff0ffaa958f5eadb6/45813291408.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e0b30b3cb---85220209414.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/44890331443.pdfIn PDF document text
    • http://cjatkinson.com/userimages/pulekusalizinorar.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6f1a1d5b---96174869057.pdfIn PDF document text
    • http://sieuthigo.vn/upload/ck/files/xuwesune.pdfIn PDF document text
    • https://artenika.pl/fck/file/26964857724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=samira+runes+s11PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 4952 bytes
SHA-256: 60e08e5afc7f1b54d25e5e08e09aa68728f5133db4960a2fcd0b62f0003e0363
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 13340 bytes
SHA-256: 1afaed8605884d9e8b24e72df87e22c16b6279c41ccf0bacae2fafec4aac0757

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