Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a0ad2d40b7cce2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 16:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c5bde66ac5e8f866b77f5058c48b079 SHA-1: 665caa4185464f5becb0cded5b1ffeb929d450f2 SHA-256: 00a0ad2d40b7cce2dbe15f64ae9c40477bfb870688bc79111ab1e923cfe71861
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=usp+chapter+621+pdf PDF link annotation
    • https://muguet.fr/sites/default/files/file/96920597040.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/75ae20e36b74a05d378ea4f6cd198ce9/90817450379.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210531021832.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/39276918452.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5858dabda---46427208289.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/fusamalowumefidulu.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/volemu.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lepapiditubugezilerutawag.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/24389255444.pdfIn PDF document text
    • https://jobtiara.com/files/files/dobemexuje.pdfIn PDF document text
    • https://citytrafik.nu/images/file/makenekobetij.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/18563133650.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/44225546228.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa908e9644---fugazunopomivila.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/41065000942.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/rabawotofuwinenebaj.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/88424501189.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160870b9484c31---towidemisavoj.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/oifeug09elmap1lfnjtjh9g6nr/gavina.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/89611394857.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/5cd7f5dfda904bc8cf25eb13e720945e/tawasipes.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/10946328150.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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 18444 bytes
SHA-256: 8e0206e6b4553cfae3c6fc36e5cc3aa13673373403aaa5381d7414e970a3c403
font_01_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 10704 bytes
SHA-256: 86abd6733e14b8e108e579b8f47fd4c837bb026fba7af3c36ab0454515225cfe
font_02_sfnt_off00012df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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