Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6057cf4bfc85172…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 09:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 339d588e2f1879bb9d3aa71909cc7907 SHA-1: 4a7fc9c71556f7001771fc9845dce8c3fcf2584e SHA-256: c6057cf4bfc85172d43dab4b20e43ada26342d19a166b8646b2f9bf0a96616e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the true destination. The ML classifier also strongly indicated maliciousness.

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 http://georgekoldun.com/var/upload/file/rarapojonexasitebu.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rr6t1kal0kfn6ag104net98d42/voperuxopinid.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160700a1b8a8f4---mudobo.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d49dc6822---juzitovir.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af789514034---1891588734.pdf
    • http://debden.org/userfiles/file/mimupuxuweg.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9da7d897978a9b643ae8e6d588d65cad/89537039090.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f83283dc---xemodibakutusobonof.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cc3f64b6d33106795d4a6801d71b80d4/37057103261.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/17c4008727c08ed20fcd32233808680a/61940255980.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098e5b6132ca---natuloxesewukexalidobemi.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda2350e6d---rutarasa.pdf
    • https://chinese-wall.tw/upload/files/kixirakanetasepefup.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160876922ddb87---xinozezubala.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/2n501rum9k1civluitqosgcmb6/zekolixevozogu.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fff881dc---dokoxixitowiziwelidukofi.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/mamivobugekuwamir.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e06982a71---42836796707.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e086f2d6b73c43b79b6a5af9edb42b5/jegozisegejib.pdf
    • http://taiwanglassgroup.cn/userfiles/file/12010626778.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nbk1lvnlve99pu9s01fo6infc7/sujajune.pdf
    • http://kbchina.de/upload/logugabajo.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ef0560375ec96c8d1cb96ab7b7e677e5/titiku.pdf
    • https://dentalrud.com/userfiles/file/49718067359.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=r+kelly+it%27s+your+birthday+download
    • 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_off0000e293.bin
ab72a5d6e3c3a5f72ee4a5e3d343ca765f9e1dc02ff43a4989c0bf3a257ea29e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 18560 bytes
font_01_sfnt_off00011172.bin
2c055847ae6c524757be9314dcb52aa19278e48040c826919d2bf9e84c5d16f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 10956 bytes
font_02_sfnt_off00012af2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 16792 bytes

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