Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50482b127454ca7…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 01:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28921758e9cd6dba57043e156aa4e351 SHA-1: 5a652e7d9654802d22c08d7e6ffc380e6855a914 SHA-256: d50482b127454ca70eb68add71223285bd09f2ff89cfcecc03b2c5a4085cb5db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

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://huntic.ru/uplcv?utm_term=theory+and+practice+of+education+pdf PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3ca72f5145b59f7daa3f51e99bb4e97a/rulepipufaxifizume.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcd75a72d---giledobuvobefijaxejalani.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/27079536872.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/tubevinimuj.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080a93880c22---44936826144.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/74ba37f422518b1bdfea050044a5a70d/10182348570.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/11147987525.pdfIn PDF document text
    • http://temple.mo/userfiles/file/pojogodufon.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/64265681052.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/50091986514.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/j8m4b73ihq4271ig44e8lssjan/wejomazexatonafuta.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/80579073637.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/gofpbvleb63kb4j0r9vbehjf4r/23348861399.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/25b04386788c3cb516982451b54fa40d/fusuxutirirov.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/pidakab.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2a1350ba---86289348605.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/603df298ed310a1e3e51984638cc2b7d/zipanojisin.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/39156769371.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086c96877f42---dojabajovipezuvexogamil.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1afde77640---pugegaginagilep.pdfIn PDF document text
    • http://pensiuneavalentina.ro/app/webroot/file/natugepomibu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3a6b969eb463b99effb049924029aa76/pamimofutij.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/95ece7d72862b59efa23a41ee4e23fa6/15163409602.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782c81107f2---44335704457.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/sotunawobugexiwalexovub.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_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 16944 bytes
SHA-256: 553b743b961034ea823d5c09abb2b986a3540c520e42d61f1e5d44c8cebb9670
font_01_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 10680 bytes
SHA-256: ee878edeb0916d2db6d7f1d67f784366186ec8224abe38e70030ee553ed46032
font_02_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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