Malicious PDF — malware analysis report

Static analysis result for SHA-256 259c757b84e1b0e4…

MALICIOUS

PDF

79.3 KB Created: 2021-07-09 13:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef52e98d9dc156fcf652030c13a7ff1b SHA-1: aa5402acee4dcae56c10be4a92535cfacbd33434 SHA-256: 259c757b84e1b0e4d4a6af831f43c238679b33bf388472d86934ddc290eaaf75
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary purpose appears to be redirecting users to potentially harmful content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://gptools.net/userfiles/file/51918974195.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/97eb7e0ae509e8d6a7ad3982edd43e5d/76611203726.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bb0c934bebbf43b2ba336ad1f1487483/3534426673.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/096b0ad6a85a677146dd0a0f7d053c2e/64327041072.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7bb02b8286dd1629f07f49f40f555295/30864476537.pdf
    • https://sgcaregiver.org/contents/files/xidoladik.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mukesesuv.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609834575f96e---39366402599.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/t95fgar9ej2ojjbsdiqagj7vcu/xubavex.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/b0r8dqgo8eh43s0gm9tl2h19r0/40823805541.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b6b87a884---96324129540.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b1f4cbbe7b6ed6962a8b3d0818ae3f0/69604374111.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/14573775816.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vtnl3dfsqpr9g61pqah4ant4u9/bomokalekemuteko.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/829cukpj3a55vd4s4so5pepc97/4248955708.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/33dec72acf679c3f0169bf8d0089d3a2/64964448693.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/95923284793.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/4741506622.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/838378383.pdf
    • http://bitite.lv/media/txt/122/file/61621918211.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6b3b6258---dezofirezirojokebisisa.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/32789daf6b98cc6198ea05c92dab24ad/28760693421.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4bf0be23a884226181f9c30288f09d7d/talinebubupodomiv.pdf
    • http://rszm88.com/upfolder/e/files/20210628000138.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724781a9d37---puvaregupenuduvil.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/sarebabitirokiwiw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=solving+problems+using+angle+relationships
    • 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_off0000d0d5.bin
e83589abb0d8af49fdc376c87e4b76a3d21b1c103e8f530178c36a7bc2cf6324
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 17180 bytes
font_01_sfnt_off0000fe08.bin
302de5c59c1d90beea496de5c6307fa2fed4f88ec9c7d1bfbf420f6a0256e553
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 11080 bytes
font_02_sfnt_off00011770.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 16792 bytes