Malicious PDF — malware analysis report

Static analysis result for SHA-256 2daf33a4398bb2bb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 14:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2fba4a023173a2ab818e9465196d6fd0 SHA-1: 0b34a6ebc27e2bd82318f1c94ab0eabcdebc3260 SHA-256: 2daf33a4398bb2bb4b1759f232eb283ae9b1049b9a72b7b9f4d38bb60f1a1d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF_URI heuristic specifically highlights a URL containing a 'utm_term' parameter, often used in phishing campaigns to track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=galaxy+note+9+screen+record PDF link annotation
    • http://mishor-uvk.com/uploads/files/14746671138.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/33203273717.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210901203757.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/mesuviromipoge.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ziwugodot.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/fujiturifesilagubigagede.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/c3413277ad841673908e0fde7a4e7a8f/pawovaw.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/16789543608.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/dunilasawovif.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/botevapoketabowomigek.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/74657712840.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/43512750435.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/01e5c175972b8b33a4a549c76e6bfe60/65072978132.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c7bb8621---38326259991.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/38709387782.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da302dbc8a---92504743990.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/94534721406.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d64d6f3cb73fddbcedc6039396e21a54/nejetuwuwavegewife.pdfIn PDF document text
    • http://azizolace.cz/images/file/mavixipatumekivurex.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/94404553487.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/lunuvaka.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/76320838679.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/23901418221.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_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 10696 bytes
SHA-256: 13072a93f67ca458b1deef5d5faac525a7f6544582b145bfe18cff5ffdf0a488
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 17180 bytes
SHA-256: b934324cb15a1a0fb0f5de875c704af41f9553cc3c0261231776f437cdf94467
font_02_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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