Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a0f0221f40bdaa…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 01:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68a4d559b9828a22cbdc26c98f157c2b SHA-1: db9991bc666b692de67a70d91ff63c1265695e9c SHA-256: 23a0f0221f40bdaa27cac211d165ecb6137cd4302230f477cb6212ecbee0bbc2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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://webtechnocrats.com/upload/file/kawaduj.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe5b469b0b---lubaxemozadus.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140baba718db---jufojirubuf.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/99578911885.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630780010.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144722c6cc22---31581700476.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/mupoloronukibivojitu.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/wonanefujujefazumakizow.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/zivufutelokajajez.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/11094413246.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/87046619539.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/42344994218.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0602777001630686047.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/narofovufumagunerikuzix.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/44643899914.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a0c3dfd0d44e13c8f191190ec7831095/90114315932.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/lumafimotupagefojarikudi.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/1434862926.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/navubetasalen.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/57046103611.pdfIn PDF document text
    • http://surestegc.org/documentos/file/lulifaka.pdfIn PDF document text
    • http://merwepizza.com/upload/file/bijikanakuvelisuxiv.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/61849395673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+toolbar+menu+icon+sizePDF 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_off0000c1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E6 10812 bytes
SHA-256: 78e5cb667d6ef014c5925cb49e532aed4eccc3544d8b2834b51533640acbb88d
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 17516 bytes
SHA-256: a5b5d0c904bae38f7c3df7ddeeb52b01863429787d6bf9d599d35b512c93b45d
font_02_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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