Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46db55ce9230e13…

MALICIOUS

PDF

69.1 KB Created: 2021-06-06 10:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 303cc77ae372e941b65596fc9df3a88d SHA-1: 858ad4c5aef70aa4ffc0337c27219bec062e1a93 SHA-256: d46db55ce9230e13b958f25366e834f6fe8cb88cc776477250348ea4ef436f7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to passing a test, which is likely a pretext to drive users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=how+to+pass+ccw+test PDF link annotation
    • http://eotp.info/sites/default/files/fck/file/35833229734.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dbgmggbjg6e3akb40usq2brqn4/90518515930.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c8cdf281---75197826894.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ku3e4v345gpfr9i0rege7qhtm3/mavitupivewosepe.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/15636637750.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/zinetowokidozav.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file/%5C/taliv.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3fc8a97b96ad33bf57b8eade4fd09544/gusuboduxedepade.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4c0dde828b05091cd38b3040d762ede6/gagaxasowibawusarusuwifa.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/lomapu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a26efa2cc29b7c5051513a4d8ce4ee16/fuxowizinibu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/71e30715dcdff01dbd08a55d4eec0a6d/44701545341.pdfIn PDF document text
    • http://mousike.it/img_ins/files/katuvuv.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cec08a8ecee972e6bff180838725210d/21762661439.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/98413603021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 4852 bytes
SHA-256: 94990957a14d49650ba1b27ec5e0f4535e379dd27424706b33481e175c155474
font_01_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 10140 bytes
SHA-256: e1d2492a1e9eb2a5916893da3de2f982b05a6e2d02c25037380cea041a346592

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