Malicious PDF — malware analysis report

Static analysis result for SHA-256 a510a1ce146e7bcd…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 23:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78a34ab3b9b40a5ac61c14e8bcdf996f SHA-1: aba8c9d63843fd84622f4c4ae08a3b5fe7555183 SHA-256: a510a1ce146e7bcd28902ca926697abb09a5c6341f4a6b6472b104260cd1dea2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37963af71---5579816403.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8aba3d01434d268a5852b8e740de56b5/limukifag.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739f28c19a7---lawabigirava.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48e41f40c---dalulawi.pdf
    • https://designclarf.it/file/vofixet.pdf
    • http://ankamet.com/userfiles/file/16271986897.pdf
    • https://bandotrading.com/uploads/file/dopimorevan.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bada57eeedb---67099287613.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c3b0b8ccfc4fdc48969e4de017c3858b/74392431049.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4a29b07e---neragul.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609881e28e0bb---27254849530.pdf
    • http://katyababash.com/images/uploads/file/63733788569.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2dfaadb9---15240077232.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2c4915145c487685025b9e252c2e470e/56929093995.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce2c5b125---66733962438.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/9hkbkhkfau6rilent1867ldlap/xezekojadimitadokota.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9710360880a66362af97b22de06b4fa6/2637931549.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1e9c7994c42430c693c168917c3a60eb/vukarazebikofojifigono.pdf
    • http://bannermaul.com/userData/board/file/rulejusidotinevinirisi.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/jovidifasapajavolu.pdf
    • https://ccskin.com/geektic/files/66326484450.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=can+you+tow+a+caravan+with+an+automatic+car
    • 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_off0000e302.bin
799a9c4bc5ece9c0799a51107930bc6091dbe8ec9907b23eebee5bebd25fee45
pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 16664 bytes
font_01_sfnt_off00010e5d.bin
7a376c0cd9b628010d8bf1df678ff05f7e62d4b96c6c1d7486458ea012a480f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 10548 bytes
font_02_sfnt_off00012649.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 16792 bytes