Malicious PDF — malware analysis report

Static analysis result for SHA-256 762d3252c62f2a7d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 02:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f789e9f463d288f9dd88810de9f07ec4 SHA-1: c2e79dc7534e87ea6ef4a9293cc56f6b0eaefbd1 SHA-256: 762d3252c62f2a7d147917a179bb8c4f0762bade7f7d177c14cd4d3686ed5004
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=charlie+movie+online PDF link annotation
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/94482372217.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/rarinokijesiteru.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/62086735058.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/judavedesa.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/9177609200.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/bipiduziboluxu.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/ludulisufimijanej.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/dabako.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc45a43a1---12576664008.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/piforuz.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/munadavuzaro.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/24289874917.pdfIn PDF document text
    • http://aven.su/userfiles/file/zuxejezuzinajakarawilekup.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/43992853065.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/v040qvd85a3clbe0jg4in7h9k5/79441847233.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210921_26EA2A403DD88E8E.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c940a069cf062c631aeeb49952895b0e/bexixu.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/tutipojumigujizazuvameb.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/bejabet.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/3378143029.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_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 10204 bytes
SHA-256: e98b6cedcf4a8feb5b493c33f5adfe980d9efcbe3e3e602f6f79e6acfbe306dc
font_01_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 17208 bytes
SHA-256: 1769ebba585bd8ee314932a5caeb9f7d1d234be41116d7c2cc4b7ab3f88e2f8c
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1