Malicious PDF — malware analysis report

Static analysis result for SHA-256 9095ee3c474986ff…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 06:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5436be736cb76b150d9c0f9971bd1da0 SHA-1: 50a6c817af92c91b23206ff8592aa9a26c5f32f4 SHA-256: 9095ee3c474986ffc20bbb6a8949fcc2bfa8c3cc8666dc670fe9fbc44f4fd986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161480d5323e6a---78615679444.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/d648d96bi9c8ln5e3jkl4j8h8l/malivevazutojinemonu.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/fuvubalupudumu.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/83721461202.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/paxovi.pdfIn PDF document text
    • http://telecycling.info/files/file/30223344493.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jewufexavul.pdfIn PDF document text
    • https://x-software.cz/data/file/jasagiga.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210927193556.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/remen.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/46851179299.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/gibirinapijado.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/vopijofirufosodu.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/26513029305.pdfIn PDF document text
    • https://domilot.com/uploader/files/pazavagaxalefebunavu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/newagiwaruf.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/tadexagotozun.pdfIn PDF document text
    • http://soupworld.de/upload/file/tosebabisesekupaxewisov.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/tivixedipubusa.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vphgddpd83rkqdverkjb8tu0gh/13808417234.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/95rl7op6u6vootahpanbfopei4/32956054249.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/6503714366.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/tejevamusipudemisuta.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/4650926169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=powerdirector+pro+apk+premiumPDF 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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 16328 bytes
SHA-256: 7a311beafe5edbf33c0e24f7cf48ef4361072823875502557372786a3e7d74c9
font_01_sfnt_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 10636 bytes
SHA-256: 8daba0dc7b442a5803b0cdafd92d97e8ded968fd0911cad5ff2cd75aa011073b