Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af4a1550640f8d0…

MALICIOUS

PDF

380.7 KB Created: 2022-01-14 15:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-06
MD5: 558548de8ff775c1dbc4ac2b47ade476 SHA-1: b4258e11ce4efb7e60e9f43223494eb076d4864f SHA-256: 4af4a1550640f8d026213de04c8d247f698995410a33e18e0c5a352bc09e09fa
166 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.6606

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://mecu.cs.nctu.edu.tw/kcfinder/upload/files/10494116652.pdf In PDF document text
    • https://autoserviziparlatore.it/filesUploads/file/12619812999.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/sujibob.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/87341285380.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/bifadakog.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tagunofewisugupu.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/80933722273.pdfIn PDF document text
    • https://www.personeriaitagui.gov.co/kcfinder/upload/files/nowimile.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6960dcb50---xixedezinipa.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/jasewasup.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dmm1ut6e7bcj1mqbgcldqma4a0/45868942103.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/zuxuj.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/57302508007.pdfIn PDF document text
    • https://www.coremg.org.br/dinamico/includes/kcfinder/upload/files/keruviwisagaxaripiso.pdfIn PDF document text
    • http://djapm.com/userfiles/file/xavewukosipisuxikife.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/47241274093.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/93829393271.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f91d3546d735f61bd4a822b32c721f4c/sologuvipipanebufivej.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/zexewavekapafebidisilir.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/51c32942f175172e454a5a2dc43825f7/neliz.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161caeef5761eb---49347592271.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1619aeffb25434---26893135755.pdfIn PDF document text
    • https://beautydent.hu/editor_up/jafafipomurapufatinofoz.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/rixuporupeveka.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=free++template+responsive+web+designPDF 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_off000587bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x587BB 11004 bytes
SHA-256: 66e2e4d4612e5c7ae319199e6e7b2674874ad6a4d8ba8ea37a6e783da3f6584f
font_01_sfnt_off0005a0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0E3 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336
font_02_sfnt_off0005b782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B782 17160 bytes
SHA-256: bdecfb6f34c91502e3a9089e310f064087f4f2f1e88d9313c26304c2aa9d6c57