Malicious PDF — malware analysis report

Static analysis result for SHA-256 468b487286b6b2c4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 01:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 568acd0c78d11690d6f6534c1ea4c3c3 SHA-1: 35e9ce17f3231bb68189429edba7b7dd41eedfa4 SHA-256: 468b487286b6b2c4c22c1b00d401da35a3dc0b4210b38c34372a1e4df0bbb1c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external domains, some of which are hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://hiddenroots.org/clients/19739/File/suxarijaxi.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130709930a81---7542097576.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/novoboweke.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/80374345007.pdfIn PDF document text
    • http://expresskaliski.info/file/85407488866.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/98847775855.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/sapuwifukuxur.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/fakupupukepux.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/pilimenepek.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/zuligemukalivawigi.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/witetudimujexem.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0609814ed---refuvodabesukoda.pdfIn PDF document text
    • https://manenshop.com/upload/files/62673161319.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/sevukilugumolevi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae6874d95---rirajerexike.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/pagipez.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/92895564053.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6dll9t9kn7aq3gs1jl4mioukq3/21891944058.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/6662072596.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609028faba0a2---24275473963.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16100331a6abac---subaretobujiribifalug.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822e6e4a827---defudijijuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=so+and+such+grammar+pdfPDF 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_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 18132 bytes
SHA-256: d9dbadc4bc95a581e3ad461f40fe0e307a0ab5c847a09cd5af0b513187c96e39
font_01_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 10876 bytes
SHA-256: d6050855b5e40a05e97458ad9f2bddd7437b2f6b8ab95e197bf24ebf50fa0085

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