Malicious PDF — malware analysis report

Static analysis result for SHA-256 530409b5f9eb87f7…

MALICIOUS

PDF

89.6 KB Created: 2021-08-12 18:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: ac68b6ab9507b4093e89a53350b81e78 SHA-1: bd326348ef295161d1f7c61b5ef470411f2608b1 SHA-256: 530409b5f9eb87f7ecc1908180e67d85402394a8df6fd3477ba55f8455a3d284
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to download other PDF files hosted on compromised WordPress sites. The presence of 'utm_term' parameters and the overall structure suggest an attempt to manipulate search engine rankings or lure users with search-like results. The ML classifier strongly indicates malicious intent, likely to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/04ea0f7f66a600c311b3f0ba503c2679/wakatexapubizujipamili.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/mem2so1dpc7p2s6j0eg8s2s8ja/kabisoxonewewefedamifulim.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99970386c---81032258012.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/47623012901.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6ca569979c627cdff097c806bffeda67/84564406216.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/fumevumurokososideluv.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/9557887537.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a5ccd65cd---52791583015.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/dogotovi.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/96032332636.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2tikfmv1cdv6s3g40n8q95mq99/vagokexojebijiduxozo.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/58145946713.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c4aa345b31c14fff57651440f8957a0a/25971606447.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gbh1t4jsqcmd355m9a8bka4iv1/49919538039.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/45800295222.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/kexiveresezoti.pdfIn macro / runtime command snippet
    • http://3e-machinery.ru/app/webroot/filesfiles/tudevusasedufise.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///mivubuxakusi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ada2b6d93---fikododekubanotozabugez.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5bd684078---gagukugoraregiwapud.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/peioulre5uabfmnemnr4hhbaa2/48710871037.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/zasokifagatutajeko.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/53120961670.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/oi91knae7nhsih0rsu00t9pti1/99625708295.pdfIn PDF document text
    • https://vietnaminsight.bizIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ardaas+karaan+full+punjabi+movie+free+downloadPDF 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_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 17768 bytes
SHA-256: 7c1765a523859c6eb2a9986327d1e06ed15e6d13104c415664fa0b05af892537
font_01_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDA 11156 bytes
SHA-256: da74fe5071b7953cb7999ec01fe54267f845123eef2cbd71cd8e2fc935b17427