Malicious PDF — malware analysis report

Static analysis result for SHA-256 115d169b5fe6622d…

MALICIOUS

PDF

84.7 KB Created: 2021-08-07 05:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 005df6ded2567843666d1314a13b6dc5 SHA-1: 68a42b94ff974c4819abe267ed3424d9a3b95616 SHA-256: 115d169b5fe6622d815cec82ef7f69c348985b7249d722dc424825e806ae761a
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 and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and compromised CMS upload links indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=fahrenheit+to+kelvin+chart
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/tawebopum.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7de7341a6e7cc0cc37e05a77b2fed320/84665591975.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zaxej.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078473c5faea---96729627690.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/493928c5359437f285e9a1483afd8e7d/57214930902.pdf
    • http://hotararicedo.ro/files/files/60028204634.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd70cdb35d---9683890311.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/99dfu1a66vge3fijiooultb1gq/2199455023.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/90cb141263c7fb2695ea7cd6c8513884/zodis.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f90fb04d0467b81d47987765b9a2e860/nedijunobuzawojatobariv.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160722f77358c1---19579912558.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebcc5991d6---vigapufuwigubife.pdf
    • https://e-tta.com/app/webroot/userfiles/files/61258708852.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1d3e7063107cc95592c190edc94bfe08/7140760402.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffcdeb9941---88666835377.pdf
    • http://health-bridge.in/upload/file/23979345202.pdf
    • https://ketdoanbus.com/webroot/img/files/kufutexasipav.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3a06513bc5e6991d3c8638c30903801c/xenexelavezilazilogu.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s701vvstevlm511m59ijp0s05d/81092405644.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105f93f54534---kasobajumusafiwumi.pdf
    • http://unseenadventure.com/userfiles/file/75108911208.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/73490923981.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856be7904f8---73479238980.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3d33c3ddd07a79331d737b1650a30cd7/matopirinizinu.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_off0000e849.bin
16a5116dec91c9e9c24badb63f11f9fa6c28a21bfb86fd7543bf44449a1ab94f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 10292 bytes
font_01_sfnt_off0000ff60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 16792 bytes
font_02_sfnt_off00011772.bin
2f64cdffdc5b744eab95719d919426c4dac4897dbfa054571ce102586ae26dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 16992 bytes