Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f74a48f256fbe6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 11:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47cfceeed77df1495e5f72e742f88e32 SHA-1: 4c03eff9d46b4784681d6dd9a716e282ad4a1d24 SHA-256: 71f74a48f256fbe6d1c5aa7ab231a1636c8a7bcd76a9d08b36c660e80188864a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=score+hero+download+hack PDF link annotation
    • http://aerotechgroup.ru/img/outer/files/pepoju.pdfIn PDF document text
    • https://limadelimon.com/images/file/26014637536.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/38356051631.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/31ea2a60a27c65028666023080e8a1da/62524736569.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/20104877341.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/kotavojajew.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/tutagasedaroparatud.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/refagoraruritufajopub.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/rovijurebikuxokewef.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/19201571419.pdfIn PDF document text
    • http://bociany.sk/media/file/59651076001.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/xekirisevoxoderefagewan.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/kipufozafososelogava.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/61854827539.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/9248495657.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/6097655800.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16148058ca7215---91382239701.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/rijomesad.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vmmqgq6qbe53khfgjhmbq4s3r9/81580797584.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/rebekatezid.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/moson.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/9734526169.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wobutuzezisedo.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/kumiwojawexubokuze.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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 17628 bytes
SHA-256: 22bf991b63951480e3994ab50ce9a3e6300966a200458dc76faae2a33d26e447
font_02_sfnt_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 10364 bytes
SHA-256: e7f5d16a51a5d69054361a91f66946becad56015ed9ca9e76e12a61dee72351f

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