Malicious PDF — malware analysis report

Static analysis result for SHA-256 c198725a365c23b5…

MALICIOUS

PDF

117.9 KB Created: 2021-06-25 21:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbdf3e55979db62ed944ced52b287ad6 SHA-1: 92926646e39bd4d556e584f92985eb1474b23e82 SHA-256: c198725a365c23b5512300cd885ea5116abaffea8fd16a8d8a6081675e3f0af3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links are structured as a link farm, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/691537cbc462e8e33e47c2627779c65a/43511860054.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160854558456b0---61297130447.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c7a400691c64b1ce8a715ac6243e1c44/juxapixoramuwi.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44416a97b4---sexusel.pdf
    • http://minuspk.ru/minuspk.ru/userfiles/file/39329180403.pdf
    • http://sistersaviopublicschool.com/userfiles/file/16929312373.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ldcg140hbnrde023mq4d62fbvk/gamupo.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2c299dde12e8ed4b2e650d271a435db4/nivuboginixo.pdf
    • https://karinbentum.nl/uploads/file/wejarilefek.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608300501de9c---puzaruzetenanefo.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf9b51100---54516082766.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78368b3bd7---91314633602.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5b4b627d9522635cbed50c47fa19c022/rijunamudivoketomite.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba7f5fd24---togajas.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/36266115223.pdf
    • http://to-kajihan.net/js/upload/files/nusafavazubu.pdf
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/laruzigisimadofag.pdf
    • https://kalitelivideoizle.com/resimler/files/41015043056.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d40412456ef---pipubu.pdf
    • https://chp-travel.ir/data/file/wanuroze.pdf
    • http://hodinovysoused.cz/upload/file/76193354158.pdf
    • http://shophouse.info/images/files/71850145796.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb086f9f1---21669044665.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce274ad80---86840550520.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pre+colonial+africa
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016bb7.bin
0b01842b41b1ecc7475a6a258da3ec96817d20b6853440729b2e5e274628df0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB7 18504 bytes
font_01_sfnt_off00019a90.bin
97a93cec02670a928fb4844322bc08fba2f2bd62d341d8fad5a30ca37de9f6bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A90 10064 bytes
font_02_sfnt_off0001b0fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0FD 16792 bytes