Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd996b140d6ad16…

MALICIOUS

PDF

69.4 KB Created: 2021-06-25 00:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 30bfc6630e7bf4cbdabccfee468ae9e8 SHA-1: c2368a6aab18855235d44a8982d5d551f92db637 SHA-256: 6bd996b140d6ad164907426e700813f683996f4f4946f48ae8cffb4491acbdc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document is part of a link farm hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and the nature of the link farm point towards an attempt to redirect users to malicious content, likely disguised as a free PDF download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608201ef7fc2c---zaxederam.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e31ebd267---72272829251.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/dufonoge.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a84cf3e5cf1ace6a20187f4a0e20b061/9821433146.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/kibebukabaforusag.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/pg69t2evc42ub8nm0j0n0tbri0/sujivegag.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/99710850866.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c077bb40261---51544008425.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5c283ddbca393916ecd91a6434b99efc/feviwubadokaxu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/3fcee194047a8a5b743c3f2db532ba08/kopodujavu.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1621538062749341452.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/1332017472.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2aa747d2---xubumifi.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d206a8b2c2---73913595327.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/gebakaxara.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/497ca6d5e553aa175f556d088fd2f6dc/mizoduvafid.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3r31n445nq5tg5gnce9ajbrbjk/xuvigefitisivomorizum.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8aq3lpg6c1mnp2enphfgp9l9e3/lesuxijo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9cb8b3485---81485502745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bible+for+download+free+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 5140 bytes
SHA-256: d8bd24ecb2b9fdc3b8f0a026a44565d7413f44ff394ae80909fd660045774e09
font_01_sfnt_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 10628 bytes
SHA-256: 81b3c5165304d6022a628b30c801c60deaa8b9ab2a880ffa150e0c8b704a83a6

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