Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eb86cfa2e35303…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 12:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7fbdefdf7edd60ef87edf742cabda6cb SHA-1: 64ed06ea3f21392d06ac99842a6e9856d793649a SHA-256: 11eb86cfa2e35303edc747a255d7f18d18a0c3138de49071d51206dd8515dbfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f80c2a57e---wogidudarifasetefowuxuvar.pdf In PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/jajigasabumudimol.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/wazij.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vbj6v2karpjlnu6k8mdqffl617/55516662679.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/55893121745.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160792f20e35bc---buvutifajofu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8c4b380fb3d6810fe7cf8acf1e990266/kawovafukusazuvu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab00064596a---nazekofosenizetupajil.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/47032284681.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c22e20c0---jodidepazavorunu.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/33312717949.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a871546c3d5---92304710815.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/pajaferog.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d168f41711e6bcebdae3dcbb5c5422fe/65975016155.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/pazefete.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da62ef3f7---mamefi.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/de479c47efbc21b2516bb94d0a355138/vusopezikuj.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/wobidugobe.pdfIn PDF document text
    • http://deforma.it/userfiles/files/wuruv.pdfIn PDF document text
    • https://magerp.org/upload/files/8370624746.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/zagonutuzafizuteja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=oliveira+zilma+de+moraes+ramos+de.+educa%C3%A7%C3%A3o+infantil+fundamentos+e+m%C3%A9todosPDF 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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 11572 bytes
SHA-256: deb07ffe12e947ac29fef014e0367074f1c9aa6b51f2e9b687953522d4c7dcd0
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 19472 bytes
SHA-256: 47275ca8c6f9165b16d34b77a1f1c9513f612372b1ab69c964078dec90aeee08

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