Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac4dfa9eb3ef1f3…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 16:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b12f6b4cd7798604ac6f3fb7ed4cf43 SHA-1: 53cb8bca1147a78a50c74b88fcfc8e4c4b49068f SHA-256: 2ac4dfa9eb3ef1f3077c1131edcb368d1fc6b6b356488693d63d194b5ba0bcd7
156 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a malicious PDF used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/213503c0fb806166f7eb85fc2ec214ce/66705397385.pdf In PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/78371807cbc594c7bdfff23904598fd4/24700417671.pdfIn PDF document text
    • https://puppometalli.eu/file/51136378278.pdfIn PDF document text
    • http://rozgarnetwork.com/ckfinder/userfiles/files/75229626086.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/xanejidutobavig.pdfIn PDF document text
    • http://hodori247.com/uploads/files/robavusomekesupomidu.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/golojigodaxomubozipalu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e9b59803e---lemexinogumijarov.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ecce17a9a---90467762491.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d41de8626---47398587578.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8678d9e4---sezuvofonazired.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/rafitim.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609629a8b94f8---51766833637.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3625db15---29452404262.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u7ejlgpettlk3q09nmq0r2g5m6/doludafekoxukakimidugodu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609046f7e11c5---sugegituputum.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/texebufud.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e8c04f24cc0dba735ead0fa81704e4a2/74766408415.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/046b80e043e3c52f91f6e70a9368037c/nokudovokokefexet.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/vizijulaxabobetesevafap.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/75288286813.pdfIn PDF document text
    • http://zzweien.com/d/files/kunikovodatuxuperuwega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=roast+chicken+stuffed+cooking+timePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 11016 bytes
SHA-256: 18c1f9195cf9bd4fd9c1c80a386310b995632231d1af2e60e59da3ad62daa864
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 17660 bytes
SHA-256: 2131af91a598ebc11eadb02c27b9f30001599a56696b0fb1cb3c108c2fba3ed4

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