Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d2a77b1a40af7d…

MALICIOUS

PDF

95.6 KB Created: 2021-08-12 02:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 21eaed12dbd3a87a9baf4d5bbd2a9f2b SHA-1: ca2231637e0ac86f10e49d5d0ffc28594ca116e5 SHA-256: c4d2a77b1a40af7deae79973f42dfd79117a8c9b55b4c766e6b39b22c53bfe8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://beamstraffic.ae/amb/userfiles/file/16224524301.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/67f1ffa93c166f40f5ef1a22c0176544/1288535630.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/buzuwitev.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/d3vqgdg9jqk6ffs4m925h8grju/42248729158.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107ddf5831ac---lejufowiraruz.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d66a9d47690cbea4b38b2bf870173818/guduriketuxiramufavo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/d3i8dj19am0sgb3p0ofagme131/95841816890.pdfIn PDF document text
    • http://quaint-house.com/bigewujaxog.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/93308662605.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/30944374942.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/musukexizawekidezogizimif.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fbc362b46---66072055130.pdfIn PDF document text
    • http://waterreducer.cn/d/files/30432742896.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/zavatewigolipuri.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/3909117825.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5a530baa4d7cdc6f58d1815755dafc6a/9426455692.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/75488870712.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kixofizewej.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/ratedineb.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/77090849359.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505150313858575.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/70442482425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+best+stick+vacuum+cleaner+for+pet+hairPDF 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_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 16992 bytes
SHA-256: af86d0a98e91c288073c07487dffb6b48d8f04798254986f1db96b8e8a9ba366
font_01_sfnt_off00013b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9F 11136 bytes
SHA-256: a4a2effb386124fe20fd9f091689b4b8e9514b130e078bfad40c72de4d482009
font_02_sfnt_off0001553b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1