Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b40c4c90941e60…

MALICIOUS

PDF

290.2 KB Created: 2022-02-25 01:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-02
MD5: f862fb74d39ad40aeaf95fa60743d8a9 SHA-1: 8b195f60d77b7d0f253dcb5897a0de7086f99bbb SHA-256: 88b40c4c90941e608f7936a8701e89c19ff53ca588ccec968327790f5f85de97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It uses invoice and payment lures to trick users, and the embedded URLs point to SEO redirectors, indicating a phishing attempt. The document body contains numerous links to other PDF files, suggesting a downloader or redirector chain designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6464

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://headrepublic.pl/images/files/kasitonozefadodowexutikip.pdf In PDF document text
    • http://kccmaul.com/files/files/pimebawopowetegoxava.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/87457284342.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e870b9795d5---kufilamup.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/muled.pdfIn PDF document text
    • http://panova-art.com/files/file/34975605653.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/mumipova.pdfIn PDF document text
    • http://chinazzjx.com/d/files/61267085790.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/suwobo.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/19325422895.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zirezojegav.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/walimagovido.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/77954018397.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16177448b734e8---98392475384.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/8489867983.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/jewegafifisifox.pdfIn PDF document text
    • http://cuuthuong115.com/ckeditor/kcfinder/upload/files/10959437112.pdfIn PDF document text
    • https://viettrungson.com/media//Files/52643507334.pdfIn PDF document text
    • http://ovodaprojekt.lenti.hu/feltoltes/files/rotosopalaxifadozuwagu.pdfIn PDF document text
    • http://cristalensi.com/public/File/zotixusaxop.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/duvegefodedisotize.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/43919282440.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xidetofilefenirejo.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/sitazogofixe.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/95924405516.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/72674595022.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/4871635984.pdfIn PDF document text
    • http://sksound.com/userfiles/file/10471986124.pdfIn PDF document text
    • https://wildnaturetravel.com/File/63614067664.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/94343602182.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/3321585955.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/65937246210.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/77922861312.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161b551c7b1484---pelofirofulejago.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/vavinupevimi.pdfIn PDF document text
    • https://wirut.co.za/XSRYdR1H?utm_term=check+receipt+voucher+templatePDF link annotation
    • http://vector-mebel.ru/uploads/files/22068088587.pdfIn PDF document text
    • 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 extracted file (font_00_sfnt_off00041af2.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off00041af2.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00041af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41AF2 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9
font_01_sfnt_off00043212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43212 10656 bytes
SHA-256: 78ca0100fe438b942bb4c45a2acaa6f37a1ad852a7de6990f50de2d09ba737f0
font_02_sfnt_off00044a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44A84 18064 bytes
SHA-256: 79517c6cbdcc39023e368e1626c7ebbf5feebf4ed6244b6f8f491d183bc9a0af