Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32b6b5eeb7064e9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 03:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cc077810e0e0c78a989304561480f355 SHA-1: 848b051a63940658b562e480226a0761c0bcda5d SHA-256: d32b6b5eeb7064e94d0216b67804259426d3ac8c98af6011f807a8b68bc8ca54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The document also functions as a link farm, pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cavalier-hundezucht.ch/userfiles/file/kiweselivabunutola.pdf In PDF document text
    • https://tajeer.co/userfiles/file/33069155526.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6892b7a78b7898907318717ebcd1c585/nivoganizitiniw.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/zofobivireruxor.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/19874698428.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/babedumekasinowasufaweke.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/julunepuwixogov.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f4a795a742e6d128215bc943d23d6fbf/sevewukutobeji.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87634bdb2---kulapogulapekodaso.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xujeninawupemefumedupagaf.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/vavaxobenisudejil.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/poxitolag.pdfIn PDF document text
    • https://birudongker.com/contents//files/sozazugesujogikuvu.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/banogafunupibuti.pdfIn PDF document text
    • http://desertofohio.net/clients/4/43/43f38f6e2239b09326489e1ba67fa1b6/File/mebafedujijaloxanuxo.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/78429051616.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba279f968dc---77080009657.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160864883a465a---nomisa.pdfIn PDF document text
    • http://dzbnf.com/upload/file///noluvu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c4605bdb09498a2cc1ac5f50d01791fb/gebobaxumenex.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c14d8859---luxugevazilarikifevurofu.pdfIn PDF document text
    • http://envigest.cz/upload/file/77447958868.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/24759211815.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/depokesunomimobofu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b854ad4ad92---pepofozirosagofifizalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fester+addams+quotesPDF 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10388 bytes
SHA-256: e0f97f1fd8afae2a24dedfb188d9e3780df033c8e3852e627f5e93f8782fb45f
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 17344 bytes
SHA-256: b6d4d6015b751e47b875e4e45b0e105ea02bfb20e5ddac107dfb71c273d1f4c1
font_02_sfnt_off00011ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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