Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b79e37ef6185ad3…

MALICIOUS

PDF

75.8 KB Created: 2021-09-14 08:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bf6e5bc5e1a70cd5b3ec0383b1377fb SHA-1: 8b29f36be82ead89db5ec96590287d29b310704e SHA-256: 4b79e37ef6185ad3b75cc28860d0669e38a8eb1c9dfd2e04efa5e9c3df068a53
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate a malformed exploit stream and a link farm pointing to compromised WordPress upload storage. The presence of numerous unknown URLs hosted on various domains suggests a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f49qlrlqag27lu9e3u4dc969po/kabevejabogoju.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613556fe06f57---bowado.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79133718302.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/22042043525.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/talivajonufelasusodolepa.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/rixifonufunoselogemaj.pdfIn PDF document text
    • http://furniture83.com/upload/files/sibolopuki.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/16141941511.pdfIn PDF document text
    • http://spakimthi.com/upload/files/96325390292.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/67917604132.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/safurifotixuriborebi.pdfIn PDF document text
    • https://areicon.com/images/file/tasexuwu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b0b974b6---zixusuvuzafibonu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7maovnflt0k53lq26l012rd104/molejuwosukizebuva.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/6486848309.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/merogikaraz.pdfIn PDF document text
    • http://uchid.com/uploads/file/jezirirefokiponu.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/22125730850.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/28871499064.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/19099939326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=el+libro+morado+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_off0000c4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 18384 bytes
SHA-256: f324ceba484db33355a8193eea84d5823527b644ed5e5d7c6c8b361055f48790
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10280 bytes
SHA-256: 017f2f5f58a2fdc9ab4e0e3f15e6da303b0dd49f0cf9cb8d3c504d54850f487f
font_02_sfnt_off00010a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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