Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff763f339fe4a67b…

MALICIOUS

PDF

93.0 KB Created: 2021-07-22 22:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 060f9a7b8b0fe5e54a3272bedfc856ab SHA-1: 6e34bfb558007b7e88e53000c7a59f94849a2f2c SHA-256: ff763f339fe4a67b530bb3bb702cf7467649a506f6fc72ac674458d4a4c3b117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The PDF structure and embedded links are consistent with attempts to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1b140d252b7c2079cd643997c8ccf846/38420788704.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0766ebbb93---21361320548.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f84116bfeba---lizitulud.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/21050423984.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744e5530034---pamowonon.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b418e206daf---98838662253.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/40fc22c157333aab7944ba331c159631/84726859755.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/jexisebufizisedu.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/gefekos.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af08500a67f---gijamiwiwibim.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/ximexofonaxunedowezi.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/17623131940.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/sopevizibasexot.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8842ef66c046f2573f6db3a49e67e256/fasaxuvituvimiw.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n18dlc8odo6qmd0vsmr4s6gt4d/kixomigozezipumidatuvino.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b127a92a---torufivekin.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/33381611904.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05156f2a7b---xinazewadesimuwulumazija.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ac5eaf2d---jesovenazupewidawafapel.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/sivonulobudamokazaruk.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/kusariw.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e5ac0009---voragutufapewufojoxafi.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/5115175843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gluten+free+corn+chowder+with+baconPDF 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_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 10772 bytes
SHA-256: 8fa62c67f5da3691065c4afbe709855c4f459a2442fe216ed138e6bf6493c7ba
font_01_sfnt_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B3 18120 bytes
SHA-256: feea4ceeb856655d168e34422ee38f03870c341ea86d5792a34b9ec845b609e8

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