Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8d984a60296bd4…

MALICIOUS

PDF

88.8 KB Created: 2021-08-20 17:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59b53492cecc26045ac56c5f3e75ca96 SHA-1: 34aef9c0a35389abd08665f00c1419ad96b6f25a SHA-256: 5f8d984a60296bd43b052e1faa92f75410e68729b9603b6b41f06d4d772400fd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a secondary payload. No scripts were extracted from this sample, but the overall structure points to a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://yilip.net/userData/board/file/24719333123.pdf In PDF document text
    • http://mikomisushiwc.com/uploads/files/kefukoja.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/bewunugusegalobewajo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25e3415d2---48490374895.pdfIn PDF document text
    • http://pnalog.ru/images/file/88667003708.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607518b597986---lubisavozil.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/14188086841.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608980075a51c---tedaxupevojotoluzuvoj.pdfIn PDF document text
    • http://intertravel.hu/_user/file/63721540960.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/66436556774.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hmhmptd9ko445sk4n8ues7tm5/47099331424.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/bosukisuvuminezas.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9p9btdu61pcrerte35djupg303/84449259279.pdfIn PDF document text
    • https://blogsma.com/files/wonasagogupetalop.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/49409994219.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jpt9l6m3eu0kmrp9t3ohghsbcj/53783230083.pdfIn PDF document text
    • https://iword.de/userfiles/file/luniragovijeragu.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/28820570963.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/85061943190.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/kagifubedesolewirokeze.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6e11bqfeuk8kitdmbaluftipkd/18412432180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fichas+repaso+frances+1+eso+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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10604 bytes
SHA-256: aeeb8d16bec04f64fbe7c593138f53c6a14b32b729412c2fb69da4091e2c6f00
font_02_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 20516 bytes
SHA-256: ff3c6bba80af23d260e78155156413895f74f49c848a845ce9fedfac8f154d93

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