Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a259def809cd83…

MALICIOUS

PDF

91.6 KB Created: 2021-09-19 20:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf5486cb3c016ec18660181583efa5e0 SHA-1: d76e31f27693f1ca323c951f7a14b11d6671c6eb SHA-256: 59a259def809cd83b82ab39fa4fcf491b3c5250b108251b269d3a5e2e3d26f70
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 hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ketchas.ru/uplcv?utm_term=codex+gigas+pdf PDF link annotation
    • http://lycee-elm.org/userfiles/file/pemaguzetaxuxujubamejam.pdfIn PDF document text
    • https://wita.lt/images/files/14463464874.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba12c63877---11272637012.pdfIn PDF document text
    • http://neteyes.eu/editor_up/tibawagutalipuvotob.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/gaxuzidut.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0ce158ad2c8781cf05e37a63ba5f07e0/xexorokosere.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109062130104834.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16142a1a778ccf---26552596801.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/31880150377.pdfIn PDF document text
    • http://autodilygood.cz/files/file/5668035233.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/mivazurebifupepuzeg.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/99965774294.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/87438120701.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/33909806131.pdfIn PDF document text
    • http://gazetavk.ru/img/file/madaxuzikegagezorotif.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021913_20127_417.pdfIn PDF document text
    • https://tekmaker.com/upload/files/76502501288.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/gikitazuje.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/fufevimogotif.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614040e575829---nibabixed.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/wivodaxokowiretoboduge.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614526915f6c4---mereba.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/53483192012.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/4596075730.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_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 19608 bytes
SHA-256: f4e574360fd96e65bdb2a0dda11f615128581ee5f7acf07509af0bddca326059
font_01_sfnt_off000131ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C2 10456 bytes
SHA-256: 5ee1c0f06e03c00d5ee3e23d615555d130d3a12f461a1c0bc055a41d24db5289

Open this report in the interactive analyzer, or submit your own file for analysis.