Malicious PDF — malware analysis report

Static analysis result for SHA-256 4257e5b6dd23d9d7…

MALICIOUS

PDF

74.4 KB Created: 2021-10-03 15:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-15
MD5: b787c0bf89d688e103eec4c956d23903 SHA-1: 355d02cdf8ef08a97ca260335d7a84aae5821cf9 SHA-256: 4257e5b6dd23d9d7033a774350b4c95ca27e4f2218c44f44a0840b16c33a9f3c
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://harlit.com/ckfinder/userfiles/files/20210926_140910.pdf In PDF document text
    • https://visualmotion.nl/uploads/file/90672655734.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kupakewakosebu.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/malakafisunugitu.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tekopupodazixasofil.pdfIn PDF document text
    • https://showerdrainplus.com/uploads/files/202109301305283523.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/37956211768.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/23428151698.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/wusifatisotog.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/23888275120.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/magodonisu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614740577c120---budekimurutidilozu.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/xisugekufesupixigekok.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/vifab.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/44310571206.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109230316255673.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/98372561406.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/12714297712.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3302079b30d84b7ead498f66ff7361e9/mojeborixewipezukalezi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/58120005510.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151fc35ddd32---mejoruvivixogibeb.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/62397544307.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/bivawagoxevigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+preamble+mean+in+historyPDF link annotation
    • https://b2cdemo.tickets.com/content/files/67851403124.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 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_off0000bc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 10904 bytes
SHA-256: 1ff3eec12578ccdb393b422439d8754b898d20fa46141711ce579b51da02f8bd
font_02_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 18116 bytes
SHA-256: b56fa5bd51b8b5abf154c904858082c48181ad2335b99687d562ac83313226bb