Malicious PDF — malware analysis report

Static analysis result for SHA-256 37aec9f0b70c4052…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 13:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8583897313d1f51f7b5ad79c94974af1 SHA-1: 123ee4c76a0b9c37c66a7088f962b0b0d26f3f94 SHA-256: 37aec9f0b70c405298e091013266152d3e74effa4a8cad54f0076e3f6ce559db
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data, but the presence of multiple suspicious URLs strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607116d377eac---zoloxigoz.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/18007075409.pdf
    • http://jnnycc.org/userfiles/file/wumavatakusufeb.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5744b0ad---wajiliviwuputekifizasa.pdf
    • http://cerrutistudio.eu/userfiles/files/tolapasoraxonotokujogi.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bea331eafb2---14973469310.pdf
    • http://piecco.eu/upload/files/kigagalanetar.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7384fd7c5e91f95c1a8a5cb1bf779d0b/36873387010.pdf
    • http://dailyxedayhang.com/userfiles/files/63158299523.pdf
    • http://hasici-pristroje-eshop.cz/files/file/xugojawibimuj.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c547158efe8---79921129010.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/95065918602.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609498aadd53f---54076478543.pdf
    • http://frigotechreina.com/userfiles/files/5217604748.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b5ac0244d---jibamotipizufavu.pdf
    • http://chiangmai-clean.com/user_img/files/banerejarapobisifoxi.pdf
    • http://kasargod.net/uploads/file/rabulewilulatule.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d57474eda87---jogivizeveti.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dc14a154---1288653980.pdf
    • https://artasedanasingaraja.com/uploadfck/file/49903506056.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2bd9d74fe2db0cd20a39de20cb346ea9/10055758705.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/991q4nl1v9g6vv0g8ar67j6gl3/dekudobulaxajixitepe.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a87229e4---84179548200.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=library+of+musicians+jazz+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_off0000ee1c.bin
949533c6f30e392f0023937481dfa8702fe3ac4bbfe0966059d392dc022f5e51
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 16772 bytes
font_01_sfnt_off000119be.bin
77c162df083edfea1b17713b10fbdca9dc7f32a4d4b1d37ee602727c401fa701
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 11004 bytes
font_02_sfnt_off0001331b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 16792 bytes