Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4de474a85022b9b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 21:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 233336834c233c7533ad4ed1cc8bd86a SHA-1: 170921118de6881c692c23b94680e337c449ef09 SHA-256: c4de474a85022b9b4310f556f7b49e2849fbb4627e727b03cfcf169fbd364857
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users through multiple compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to obscure the final destination, likely a phishing page or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c3af39ab235823b17db338e23d37b195/87213139281.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7c1e6ff2348c3ee84591f4c98529ff0a/wokufugabagapifuj.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5294cb1838b4f3db7589c7e6f865aea4/73629893731.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4fba801c---juzokilagajoxiginar.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5866540d872d3b00edf5a78ba377576a/540993802.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/cc1b266ab7eac25a79f4e666368dd4bc.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/6239909009.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606db8f569054---66194100472.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/b63a010128b9fd3020bba283c24237f3/pikovagorata.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/pawunanujewebominebujapek.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/3956325413.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/4339029944.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fowisinunule.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081020a76e3d---73590219800.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46a4ab53a---gagiwodaludunuwoz.pdfIn PDF document text
    • https://dacola.com/upload/files/32915178872.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/33948644809.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/fawogebidimekuxu.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/nusigirebamudafuwepus.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f1de21045---79092745213.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/gabojageku.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/kevizuvu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/253f1256a0d220c8712e19a276d625c3/51139777177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=three+moment+equation+in+structural+analysis+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_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 11208 bytes
SHA-256: dbb94203778efd19c28f642d10ca958930ea7e8ee3ba138c2506f24690951f29
font_02_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 18520 bytes
SHA-256: ecf2e23c4a494a435f0fa07fd188e79e92b2b90122ec7ce7f6ffd79df9b44710