Malicious PDF — malware analysis report

Static analysis result for SHA-256 0057f24494f3baff…

MALICIOUS

PDF

88.5 KB Created: 2021-08-05 09:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3b7b02882c7062b1a93f71f0ccac63d SHA-1: 5c52e3003add1630800cacdc3c7d65558ec8d148 SHA-256: 0057f24494f3baffcb9eb6c982051ad336d235ec15323b1705ff90aaf6efb388
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://crewmak.ru/uplcv?utm_term=%D0%B3%D0%B4%D0%B7+8+%D0%BA%D0%BB%D0%B0%D1%81+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+%D1%96%D1%81%D1%82%D0%B5%D1%80+%D0%B4%D0%BE%D0%BC%D0%B0%D1%88%D0%BD%D1%8F+%D1%81%D0%B0%D0%BC%D0%BE%D1%81%D1%82%D1%96%D0%B9%D0%BD%D0%B0+%D1%80%D0%BE%D0%B1%D0%BE%D1%82%D0%B0+5
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912b151fd7d---34206191021.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/77758677144.pdf
    • https://limsurdua.com/contents//files/zupesakaxusujajavizonugog.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1f60315a2499a630bb663a33c6cc5da5/5083773998.pdf
    • http://chukgoobok.com/files/fckeditor/file/58611761277.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609115392f94f---buruweruzafosulukarevag.pdf
    • http://golden-candies.ru/webroot/files/files/lexatuxojanimefuruk.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608375f7c7114---kilirekirojevorovexonobi.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e9468a34---rimavexa.pdf
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/9iipm4tin21nekqhhij7qhj81v/27632938584.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c808d067649a1735136e98c0f5ef0f28/fenedadazonupaxubeterufi.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f32f7b6dc7310d695ce8e2183e0d38a0/wujufu.pdf
    • https://www.sterlingsez.com/ckfinder/userfiles/files/wuxoniwuwipuwukipo.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d1ec6ed824abb7771dae55c33f75d124/16445560312.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9e69c76693k3oo4m8ercek84k1/jajesimebab.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/572edc3b582f313e4069dd2824e359c0/70770696143.pdf
    • http://allnatureint.com/userfiles/file/pipama.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb8fa70a7f---favinozan.pdf
    • http://historia-bfured.hu/userfiles/file/vegovilukiwazaxifawobef.pdf
    • https://retake.dk/ckfinder/userfiles/files/bezozosuma.pdf
    • http://goldnumber.info/userfiles/file/vifonidurev.pdf
    • https://glycocalyx.nl/userfiles/image/file/jaluf.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5587300733---79416349306.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_off0000e290.bin
0569f4f6604ae5081840eaad2a2ab4fc9941506fe3ee0af64732bf827a33dd44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 23116 bytes
font_01_sfnt_off00011cb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 16792 bytes
font_02_sfnt_off000134cb.bin
4cff621bbf9c396ad62b1bc449b4443d54ac930d8e1393cce2b2f37ceb7b0431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 11492 bytes

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