Malicious PDF — malware analysis report

Static analysis result for SHA-256 46263bad362b84db…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 17:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1af4f67fdc867fb836f4d51b210221a3 SHA-1: 485e36f20c6878bc4c508b7ddf17d58d238bb061 SHA-256: 46263bad362b84db0158f9f5116c9f55ddfe11647aa0c95637df6f202239b722
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attack pattern involving user interaction with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=ninja+moba+naruto+mod+apk PDF link annotation
    • http://zawodydrwali.pl/app/webroot/userfiles/file/jolurezaxub.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163085065168.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/d6mo3veefuhb8phddfdpjje1ut/sigibopefufejupi.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/zikudejupiwutofogusewa.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/66mpt4708essiqro7gkk79grbv/54231464884.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/jerimaxujalinaruvori.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/55379804114.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/79154569169.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/vesibisusogavexapovipagu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/emog885umjs5ghm3v79fn0nn7a/dabewonivabalipuzuba.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/64723153943.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345b64aafdb---60190229755.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/43405126614.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/zavorasupotaliv.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/33146457306.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/38935404786.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f21dd55e79---244214029.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/sipusud.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132f010eba96---wadosotimopurunokosik.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eefb91726---80523219490.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/091454469702.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/bapok.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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 16696 bytes
SHA-256: 12f3cd9ba9eeefb920d367d7c046692711d5c3b971579d9b5c9a584ec6c64a01
font_02_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 10648 bytes
SHA-256: 0c592cb378597e1fd10beb7b734bd34f0aa56bce0ebbfc42af6f64ab1e994fd9