Malicious PDF — malware analysis report

Static analysis result for SHA-256 0309f3953380eeed…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 13:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5942f27011ffe34b51e0f72f6b16b6ab SHA-1: 3ea05c0befc266da506d299f22756a61ff7c6c2a SHA-256: 0309f3953380eeed8267c2fbda28de1e5cacc733f5f516bb8bd8daa907c94d86
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various compromised websites hosting PDF files, likely as part of a phishing or malware distribution scheme. The presence of 'utm_term=letter+of+intent+for+promotion+template' suggests a lure related to business documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec522825a---79449406813.pdf In PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce43b1f26---61901340268.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/61945060932.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/43d556fc815c72c3d40bde25d43e4610/89655090629.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/26973567290.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/35351729969.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/zisugarokepameke.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b7d4f57c---zevanejadavujamibixolibed.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/lekezaropitoke.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16097755d21a3d---zunaxukenokofuwato.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/lumetekexosefeloget.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50edff61721cd7fb677738a9d23e0929/wovagowabevexibug.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8e6bb2310ef67fd852dab9a4cc7be84a/timokeribokutu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb391a122d---lowogorozizopexubu.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/ripefuvukonolivar.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/kopopinumafukegat.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/mapegefujerapizuf.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/vagofigedisinojijikewuwi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/l16ibu4oeskot8pjvp9t6991t4/55613833110.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607857d3c56dc---kabupuzikafuzozuzesadovos.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3363ad112---kokedipefonaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=letter+of+intent+for+promotion+templatePDF 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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 17356 bytes
SHA-256: 730f60c56161a81f1bb12976eeaf82284d3d4597a43d7d9946afb73a29cef5e3
font_01_sfnt_off000119d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 10308 bytes
SHA-256: 58d87630f1e5a483e05af8cce08cdbfeb9b581715fd5b1c141c41c01c7038a9c

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