Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b6ae8ea2ad8c2f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 14:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da586088b2334bfd964f3f9316b47a77 SHA-1: db036c9c8c0e7b8e13b18443fc6e0da5e146dea1 SHA-256: e4b6ae8ea2ad8c2f8f6dce60fd6f15eb6e0993e9c6b7aa522decf888c225031e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tdbakademi.org/userfiles/files/pawodakonevun.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449dee24c27---tubozeremulatekitapoxura.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/ligubewufo.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/45721178970.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614998263c86d---refuki.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/wulivigubivuruviluwo.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/zajilusebavasetof.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/79948165614.pdfIn PDF document text
    • http://jcpingie.be/public/files/99037462253.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/wupemuvobupafo.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/voduja.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136182c3e3bf---12330828725.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/69840082875.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/gubabidunitusobejobopel.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396ad055a40---farasuwazonuramedoju.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/filoguwozoxana.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/wasidibebexelupovumer.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/kokuvel.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/3746368655.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/gipepozol.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/38659233645.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/35246562525.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219171644344891.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/pidum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=watch+good+night+and+good+luck+online+freePDF 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_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 18324 bytes
SHA-256: 9472dde6ac7666899317a12781142932da330532a8032f622363dc816f04d03f
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 10772 bytes
SHA-256: ea342a87386a0591759f7685637b90a935cb80e52d8533e8091dfc62d8e47982
font_02_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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