Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e85927d2d1ea645…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 03:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c340fd46b1cb33d4853a4b064061cb5 SHA-1: 6f77030bec81735220720e2c78dc3947f08ce632 SHA-256: 9e85927d2d1ea6456784fd4f0824103def35d8c9c1f2fa2fd75100247a89d3a1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links suggests an attempt to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510213ad1f0---ximekaf.pdf In PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/dezaxadusa.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wubijabigotejulibi.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/pipokedomarufupasewusene.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327f467b155---ninowonofeduvagir.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109270712221487.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d642e87225---tufidowagakamifevariwes.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/32477634022.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/noxar.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/tomugipumunabuv.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/nujasezatuselabomizexo.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/wazodipamexogavadumav.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/zowikasutesovegez.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/niwotaberaname.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/venogutodu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef39be7d3c---64233909913.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/69995486115.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/4176655031.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/28825420429.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/zukupetijinavefutudebiwi.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/bipuw.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/76318628377.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/zefatuduvukipureluf.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/fidowujemirixodok.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/zefikokabusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=illegal+websites+to+download+seriesPDF 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_off0000b7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 10600 bytes
SHA-256: b4328550ea23981dfd7fb55a719c834a8efe62e8957bcddb362e639412e87e7a
font_02_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 17164 bytes
SHA-256: ba8bb27e4c8900124cd354473515276ba9f25e80cbab71777714ab1799fd3794

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