Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce460256bf315496…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 07:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e284fe2e33ba0b85ed32c6118fb26d8 SHA-1: 77363fa6e0b531393352d0ff9b05c7fafee46a44 SHA-256: ce460256bf315496de7dcb7a61b6b1e26e1c6302552d4e3393f82d9339ce6b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cba7c215401---57977324219.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aed91be57a---zepimi.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc573179a5---75695730082.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608572b077cb7---37548231309.pdf
    • http://otvorene-srdce.sk/userfiles/file/47867286987.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2ecb31a2---vagirixenoli.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be81b285bf6---23513117105.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072807ad53f7---62121537961.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e3f0d5dfb1ba6b9957394e327d4ff374/71117233868.pdf
    • http://venusland.vn/app/webroot/img/files/tovobokavusaxuniva.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/a4e932dce3387cdf2e5903c73b635895/68990055614.pdf
    • http://ozari-ua.com/files/file/melaxeke.pdf
    • http://zjxfjc.com/uploadfiles/files/81228457877.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c483220d87b---vusivutedenodakifozen.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2c353386de8e3b3e487f00fd90303a7c/70582422044.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b463423f925---93568020779.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3bfd3e391a0ed0a35b89851824c42d3c/45231072785.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e5726e41e4af75f3c013ec61878f42fa/nowuropaj.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vlnsn9jnsgr5l8cb66aj8l6p2h/36742185604.pdf
    • http://www.ecostroyservis.ru/File/88353364432.pdf
    • http://lezeckastenakosice.sk/upload/files/74586079878.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3ce0ltucbsm7o4lomk5e77emgd/foxovomonigixumawavas.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4558712a7---wosavepipakudovuwosafojer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=solve+the+following+system+by+the+substitution+method
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e183.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 16244 bytes
font_01_sfnt_off0000f770.bin
0282271ff124c48f35c76263d851466b25927831ae963a43568f48b78225a071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 11120 bytes
font_02_sfnt_off0001110c.bin
627949a82bc6b0ffc63ee2eac6389c047ef8e5facfd423aab942115a4122db8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 17440 bytes
font_03_sfnt_off00013eec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEC 16792 bytes

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