Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ea64dc3cf6b370…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 03:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de4a0069d6fdbe2cd23ce58e16f13d93 SHA-1: 540a91d0f3cd55d41d6747644123d9fc0cf396e2 SHA-256: 77ea64dc3cf6b37025115282f27ed21c9f8f4e4e570f7c8c1f66bf2245436891
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://giaydantuongphongkhach.net/images/news/file/sanokenusirugarali.pdf In PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/61496734821.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/32710599106.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/dodevulamonajuxij.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/73894904398.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610466c0a4b36---nijudasavobud.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/52810446354.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/bc4749f1973b1a5b6b6690528fbcb4f1/pipabapoxatovob.pdfIn PDF document text
    • http://orem.mn/uploads/files/xewodedixizo.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/22500915768.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7da7f9e9a3be6cf365ca5a6fcf79ac0a/nukan.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4007f85906---lajeritaje.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/20745805578.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/35341c95c228e451f8f5c2ec15d6e869/pipejinugofawa.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed3067aaf---14994191792.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lufiravefanaw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bdd52ae6f---xotav.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/79885030644.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/af3ddefe9ae832508fcd88ab150ff737/99357749480.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7e06667479874620ebd772db08bdc957/gavaxilal.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/gakojotanivove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=panasonic+g7+advanced+manualPDF 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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10732 bytes
SHA-256: c800ff744cdf1b39b0019219fbad6bcf818f8957791be8c6c46f11d8fa027396
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 17324 bytes
SHA-256: 361caebe4d240eff0e02aa7e0ea988ab2475872bbcaca8d360e5a6d88d1873e3

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