Malicious PDF — malware analysis report

Static analysis result for SHA-256 505c68486286661b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 08:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb44351faf34f049865e52ef989d6aa0 SHA-1: 90b352d95c8636359e9a4cabd377250426c21364 SHA-256: 505c68486286661b8a710ba545260a192c2b2276953af3c6e2e4ba761c23828c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2d600ab97ef6f37d38c0de6894a55d69/mugojajonavivomo.pdf
    • http://mardeestilos.es/fotos/file/risemim.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e9e3d77677d1f6f2e4ccbc32d09081e2/botemavikat.pdf
    • http://zlato-invest.cz/upload/files/zikurenixil.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f5b905e2---34148174607.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5880ebe2d---48878797398.pdf
    • http://fittbikese.hu/files/file/gafedarerojog.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160724a8d41946---67043935700.pdf
    • https://aprilboya.com/userfiles/file/3628342142.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/33382540807.pdf
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/9015333673.pdf
    • http://climacom.eu/userfiles/files/72197692813.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68ef1a949---xudumor.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080789fa7cfd---jazopusuwibudijuwejewe.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad0e9ee24f89ab5297f719a9da7707bf/26210948752.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9a62449cd9804ba1fd62e095ffb02e3c/55452438793.pdf
    • https://zivotzaokny.eu/res/file/wipug.pdf
    • https://selispin.com/calisma2/files/uploads/72167897431.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/1924871814.pdf
    • http://acudrved.com/ckfinder/userfiles/files/suzopezonetegenepajik.pdf
    • https://akemi.ro/hirek/file/85471810767.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b7e8e587---60702682620.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6b3b22af28a9a5948d91607419d56108/37387407679.pdf
    • https://luminex.pl/upload/file/beposuniliwimogi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+reliability+centered+maintenance+pdf
    • 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_off0000e3ec.bin
b5a0a6731ce52d564d58e3427d900445aa24bc49cfdfde45c318c2c93051bef4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 18160 bytes
font_01_sfnt_off00011351.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 16792 bytes
font_02_sfnt_off00012b68.bin
9e02d2550234d52a86a4712b5ad35baed7fb7084242d32a53834c876ddb48203
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 11012 bytes