Malicious PDF — malware analysis report

Static analysis result for SHA-256 975306e0fa14a9ae…

MALICIOUS

PDF

90.8 KB Created: 2021-05-27 18:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 28898c8b637fe81554f5876ef2cdf4db SHA-1: 1faa60b7417e915cbdb3302431bb38c04402b7d9 SHA-256: 975306e0fa14a9ae083c8e9cd054b14d91b331a427edffc55009e00a892e2545
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, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=regras+do+jogo+monopoly+junior PDF link annotation
    • https://nikosdimos.gr/userfiles/file/20761971735.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609237c2b1648---budutobonerifo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/31060111230.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6ain1q4en8p9kh6lo3esrgqslm/rewufupa.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/latiwido.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1c1f529ece736039240be8e0749c9316/57268548801.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ko06jdd7vji8ndar8rl48j28bs/pununufigusilagisixaro.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/88143501660.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/29274081565.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d880b036---23878221946.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/totepusoxarozorodoz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1jf0q80pm9mar6csi2cptl0paj/41705321649.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ac7e4464---wetijarasodukinuneruded.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160949e08eb443---zorimevepuxateribexi.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e973162913938a34b5b991f810ad15a5/95649094937.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 5464 bytes
SHA-256: 6e3031885e6fd4e2c44709f5acdb21ac370161eeb79f96035cbc5a9db3fbb744
font_01_sfnt_off00013557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 13132 bytes
SHA-256: df56f8eb9d6d997497513aa4002080efaa7cc827f275b1b02c3ece15e15d2656

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