Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2ac73a7a98efad…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 22:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28ffe9eb85182187a2f136ed7b83c76d SHA-1: db548f0dda64a89d2148a91096b9e1b725fccf20 SHA-256: 9f2ac73a7a98efad91c86513377ab58eeefd34d46ab1a909daa9da21cfdf288b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=logo+maker+logo+creator+generator+mod+apk PDF link annotation
    • https://orangcar.com/app/webroot/upload/files/96784444154.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/pusefara.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/22223359286.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/91013590873.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d8a29ea98ba64186acb1b0c705d86b02/buvofujejekixoruvaxupi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/pulatidigebaxuzexaxiw.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/fonuzowad.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/beruda.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/figedipobuga.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/tifebavi.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/23914828033.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/rovetufepoferugor.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16146acb348346---wazafutaxepewibisifaxit.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/rijodumuluzexuzaxati.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/gesigepokiburisa.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161342b5b00f52---kuzujuzanosurabos.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/6943092823.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/47538312900.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/72496538129.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/kunolupoxabipuluxobul.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d364330134---40394191881.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/18458687461.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/nitilegovemodo.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/41869475508.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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 18148 bytes
SHA-256: 4c28377d3e238e2e6cc90cfed198338c5446fec2a36a46187ba1c917c91cc303
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 10648 bytes
SHA-256: efd03b408bb07b644f6085e5a5bb5f9a57421b98afed7609ae1d57f2de1859df
font_02_sfnt_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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