Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfe8be9630aaf94…

MALICIOUS

PDF

90.4 KB Created: 2021-08-07 13:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b929909c0be2b879e90de785cee710f1 SHA-1: 10fad3946b16764d37237f4b6da7cb1f3f1229a9 SHA-256: 3cfe8be9630aaf94dae4511d95c17f0306f25995fe4a35d5b15397ead63bae75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--o79av69abka850ab6c.com/upload/file/202106210115419622.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c635cece9e---33932675049.pdfIn PDF document text
    • http://ymmicro.com/files/files/xozidixelotagale.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/29197465677.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/patozifak.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/vizubajamajar.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/459d645de6dbf9366a4dc731122cd242/similekavoluxadime.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722c04e738---kajedenabaxuna.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/94076786309.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/596d06f2ceb3b10372859439fee59f26/25679280238.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nqh0icgqhelrvcoos4fn6hmrg7/gixolupugedoni.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/28458422262.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/31705404339.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/49d7f6d1abacedac88e328316245beb5/34111764341.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/nexafegukevizuparosej.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8f3ee255---fegemiravakul.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/gelenonelovosa.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/nikup.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/zejitosi.pdfIn PDF document text
    • http://charivne.info/images/file/nalaw.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50955410f4---dokijapidukosujumuxo.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/zitevawaz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/de98p7tvap8guo9c8gd6v7sf56/28049515718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ejemplo+de+p%C3%A1rrafo+narrativo+cortoPDF 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_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 18368 bytes
SHA-256: ae7d63d665c8c40e270cd3c3b3f6a2298e19a09bf09bf4853fb9755781a1bc3f
font_01_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 10972 bytes
SHA-256: e2179a0135241a82356fcc4895aa3733197d4a66cd67b5d0282765f02d9f1e89
font_02_sfnt_off000140a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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