Malicious PDF — malware analysis report

Static analysis result for SHA-256 9346af4228e60c96…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 02:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afa4cc23f3308e5ae4b83ed9db2517af SHA-1: b5f77a94c44fcb5a73b458d2c1786b83aea821bc SHA-256: 9346af4228e60c968ee565567871343b91c972684d88d39d6471a53010f4a6dc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of encrypting payloads to bypass gateway security, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=tamil+names+for+baby+girl+starting+with+s PDF link annotation
    • https://igraonica.me/userfiles/file/41541546563.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e903e3a2b17e2c40be3e1572e95a05d0/jivetuwejujiv.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/kojezerunewezemes.pdfIn PDF document text
    • http://hanleyresources.com/images/zesogudexiv.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zemefoja.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/6367697235.pdfIn PDF document text
    • http://berbun.com/user_img/file/61278882120.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/jenobaletemebogu.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/72613834214.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/suwobipa.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17d1b3b066b7a9aa6951c901652fc0bf/25581652735.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d66a9ce26a8---lezupomunak.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/12236421300.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/98086155041.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/mimofix.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/11777200464.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ef3942ec---38733076760.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/13684943479.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/vajudojavawanadovetaje.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/bbb3f28a827650808534fa6a979ec6c8/70911462408.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611800838868d---nuranaxixen.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210530_3C1E4B0E34EC4AFC.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/nepokidiwatefefaranafosu.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_off0000bfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 16208 bytes
SHA-256: 519a0a0e85bf0b378dea52dd94c8ee8de467280857547b228e09a2a10f350534
font_02_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 10964 bytes
SHA-256: a46ca6e9deefa263d2d48769be346ff1f22dc7f06e6a94fc6923e01aa2127fa0

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