Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d425e7cb3655e1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 20:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07703efe1e4a02734468d3461a0c85ef SHA-1: e49331765792a1ec35027fdf22da70d9c330a80f SHA-256: c2d425e7cb3655e1e1c79ebd8cde6b909351b5c923ffa6f3419029885b91a419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious websites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://ketchas.ru/uplcv?utm_term=workshop+manual+on+cd PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4noeun1beiikl5kt8bqc8b0fkf/walalofojabewu.pdfIn PDF document text
    • https://noventa.cz/media/files/file/98582120157.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/60161819974.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/kofivusuwanigukon.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a17b14d1---mopamakopilopixaw.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/acd113e69d2fdc0177ab28ed4136acc0/lenala.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/nusebojupo.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a148267e58b696e3708c7e5d8d5ec19d/2474462950.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/93218569398.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/16955887646.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff80c5b6811---pagem.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/95ba06c93293b557abdd20b44e5503ed/xuboxew.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/pivuladugubekobopugunexur.pdfIn PDF document text
    • http://olympusflights.com/files/files/ruleparesevu.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/35206415189.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/88149360713.pdfIn PDF document text
    • http://mopron.ru/upload/files/46672747736.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/72101259069.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/c39c91fe322807dcbfb7da1fe93e10e6/wozolenedojuzosuj.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/bufajen.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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 18548 bytes
SHA-256: 34f4a98137405cfb5b28d9b577d0cf0f7937bd9c5e448168c3d60150292a83ca
font_01_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 10644 bytes
SHA-256: b8c15241a95cf952276d38c70bb5324146e8deb30107cfaa11d5a89e8e6eca8e
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1