Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbeb38c0e280ca0…

MALICIOUS

PDF

89.7 KB Created: 2021-07-25 13:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e5d35e84c71363bda17adaeed39e07c SHA-1: 3caca6d1bb1e74b90ce20cdd83786d144aea7af0 SHA-256: 3fbeb38c0e280ca08fbca397723fd7671ba3dfd488d8e1a5fc872cca5b79cf6f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. These links likely serve to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://automotiveenergy.cz/userfiles/file/59801971521.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82f274fe5---bovupikumokotatuzarefajok.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/98622298107.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/tuzugupewiwiludekuta.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/24603067195.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/27019579902.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/f462557e919d27d3dccfe59cf6ce796b/pibexi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd271f1e8a5---bogemolitemeduso.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/raxutabupuwe.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607216ceafada---66400314168.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3580d57fc---45835824018.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/wajij.pdfIn PDF document text
    • http://yilip.net/userData/board/file/27175052787.pdfIn PDF document text
    • http://esangsok.com/upfile/files/6419239874.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a84545c1---26735103532.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b4ba6utebitspb37pppt7s9dj2/tavudevabusene.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6db497e7a---45807806626.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/2709286612.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab614ca8908---79153955219.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/835e34715c5fc9578308ee006d29d8b7/jodidupe.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/gowajukenowirovuwajaliv.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/03810a3250b04a9bc4bf2c2273a408b0/degawigawitamudabu.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/48398838044.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/pabijidifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kpss+matematik+%C3%A7%C3%B6z%C3%BCml%C3%BC+soru+bankas%C4%B1+pdfPDF 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_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 17632 bytes
SHA-256: 10c7082335ca8737cf38894402c99d4f297726769c6ef74fe0a9924f5f80c3a5
font_01_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAB 11692 bytes
SHA-256: 9addbc7c828c12361fe3f50b4cc4a0559ce24a4f789bddd0161aac60454b00d3

Open this report in the interactive analyzer, or submit your own file for analysis.