Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3cf1e749d14c0a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 13:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0edd537e0a0bdeab92b218b84f8622c5 SHA-1: 70754118a938915fbd216d4de08c780d7143977d SHA-256: fe3cf1e749d14c0ad24629626ce4be8326d59f36fd425628e6faf28a75f09dcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=past+tense+verbs+third+grade+worksheets PDF link annotation
    • https://selltoob.in/ci/userfiles/files/bojap.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/75238009244.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/45669396522.pdfIn PDF document text
    • https://hirurgija.me//files/52758470390.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/78947794536.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/de7ee376bb612decb498a4abc0d565bb/talubekuwiviwetaboturet.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/19885301690.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/97823463176.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da30ef2bb---38385426041.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/80493888837.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a101ab5f5dc---bukam.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/11681144771.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0be20568b---23022202247.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c9a7516b---78304098738.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc489f42ac5---kasuginokuzujaduzuba.pdfIn PDF document text
    • http://erpos.sk/data/files/dufija.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5f86b5a09---21494259265.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/pepepixab.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/33827693907.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/8172945735.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/xosemowudezijovonanafam.pdfIn 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://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_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 18052 bytes
SHA-256: 9b9ae2561aeac243efc9d237f3d7240c5ebc4599e8912e9156e8d47e8e4a9cd7
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 10868 bytes
SHA-256: 9a5041af48904d4b9ac2a030ef3df9279d3457a70e8632b1e44973d41cb10c57
font_02_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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