Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0814aa6fdbdf4f5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 09:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e858400fc4f2d5049f28fe48bf3349af SHA-1: 1964306c08ad463e3a9ad6fcfda319318a40601e SHA-256: c0814aa6fdbdf4f5efe514db0815f4ddd16c2ca1f954fabf4f849efe8944dc20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to exploit user interaction to navigate to compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=how+to+get+surgeon+simulator+2+for+free PDF link annotation
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136d43716d60---76830138211.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/68727529380.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133456b6bf2e---6107380449.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f893ea3c45ebe2fd6e4000bee1b77916/39295531618.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d93ea8b2d---xowuluzubopig.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/koradavifoze.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/52557888840.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/36942395909.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/monilabewokake.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b04ad49e8---kanogafixoji.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/38565771643.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/sepefixofalisegezovudi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/21645205882.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/46101351581.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/99021647763.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/lokowikike.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1eee1e925---fafivijotojilowiduzatese.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/viduwoxawipif.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/pimosimuruworonifusev.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/19765680217.pdfIn PDF document text
    • http://metallpress.ru/files/supobopaxeluguvakek.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090722193470554.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/88830063056.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/ronobuxumivel.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/xewilixafo.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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 10856 bytes
SHA-256: 5caa2a00c5d4b2c2f8b0d9462187f85e4152d0740a8a47ff4a79f718d3093d3e
font_01_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 16836 bytes
SHA-256: dacc81ae0fb0a1ae2999a44c23d2c3164bf729d121098b6f3b0ed88602d8ae80

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