Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2316b42e92d03d5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 16:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0503a519cb876ceccbbed110e3d0358a SHA-1: c4f136517b3c5b227b818ec34b37264ea6f74c8a SHA-256: e2316b42e92d03d55d9d6ee7a7dad2026ca9d102c02c4999ad6774d29d41cf18
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://stka.gr/ckfinder/userfiles/files/fotureripazewodod.pdf In PDF document text
    • https://barcelona-health.com/files/galeria/files/siwenobepumurowavenulaze.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/55743359686.pdfIn PDF document text
    • http://cartopack.be/Images/file/49714779153.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/ladukatepomigeruvuzo.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/44678514692.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/1511679120.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/68491015914.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/suxarisorubobovimarobaliw.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/29727165055.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24cb1f15fb04116098b760bc79d69bac/noden.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/12603006214.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/85001981864.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/xubufuwidaziw.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/82527023285.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xofuvopevuri.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/tipifexitowaxonuxux.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8590d37d8---pukigubozatatatinirajedi.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/zutejogefidesokuwaga.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/zifuzodexatinorubi.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vafodoketoxorubuliwofaxe.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/sirolaxeneno.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405e71de61b---66941638542.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/vekutidi.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/pafan.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/17156134583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+harry+potter+4+123moviesPDF 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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 18984 bytes
SHA-256: a60eb533a3ed907d1e65061d451349d6fb0f7a29397e7d9eaff0da7eae1b2020
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 11084 bytes
SHA-256: 7c3ae332f70cd87df8a1d809366587716db2717b3d784adbf0b332fab7ece46f

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