Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d0c766ca2d9912…

MALICIOUS

PDF

142.9 KB Created: 2021-07-03 09:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7eda50c6acc4f2c1655847102006d82f SHA-1: a74de7b05446e25e63e18af5e2019a6ee53b57a9 SHA-256: 51d0c766ca2d9912555b96a244cba720584be733b499512e7d5d160427a5e394
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://heizler.hu/files/file/wewufiwafalujodifoniji.pdf In PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/524f0fee1ea11973d7fe659698090b6d/xarazupujuwopuwegaledami.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/vifepuzekazat.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/mezubaripexipagop.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/19208058167.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0698b861---98376970664.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e19414aad09703f881446f0cbe97affa/nejudodasaletevetapanitoj.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074823851bc2---99941669001.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b5559e48---2462279993.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1f682443---dafiwezojukinadexifubiteg.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/rivugarizosirimulem.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b661c83c653a2b1fd17fda57350edd91/bibukuxasofuzew.pdfIn PDF document text
    • http://aps-mes.com/files/file/nerijaxus.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a320b8d6037939017ae535a6487eb557/94903356453.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/nobebezodejoxuruf.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/50ea3367a6febef16c7f958f479a6f0b/5774654127.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bff9375c403---mavokafibelubojod.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d95fdc1f205---35135925982.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/95746069069.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/gomiwikof.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160728c2519c29---tofole.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80aa49893---duzipevapelites.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/3d725284beafe4dd22a3fcf0d79e8d6b/2912398639.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cecdb1b3fa844473e59bfbffbb7671ff/37763766762.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/kemubusomexogizobe.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/80459309541.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/rosolemijavufiwiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pathfinder+a+flower+in+the+swampPDF 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_off0001ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE87 17820 bytes
SHA-256: 226809f5a94189f1a9bce0c3c0a1bbfb504740b2b46bc0fb38beb39eefb21977
font_01_sfnt_off0001fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCB7 10852 bytes
SHA-256: 64a4687e7ac6861bf6ef0c7627bf2fe10b3a2a47b64b7d483c50217bf7238a60
font_02_sfnt_off0002159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2159B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1