Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1257d2af56fb585…

MALICIOUS

PDF

245.6 KB Created: 2021-08-16 13:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 37ff0d20fd54e87c75cdbf6bfff3530c SHA-1: 44aebcfb9ff28cb59e507028f7648590e720fa4c SHA-256: b1257d2af56fb585d80d4ddd03a223c089eac8c907f02e2bc40c07442a054ee8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous external URLs, one of which is directly linked to a potential phishing lure related to educational materials. The presence of these links suggests the document is intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8874

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=amplify+science+answer+key+grade+8+force+and+motion PDF link annotation
    • http://geniuschulatutor.com/userfiles/files/rirupogetetositelefili.pdfIn PDF document text
    • http://poultech.net/d/files/bizoziwunumelizibojonizo.pdfIn PDF document text
    • http://edgecs.net/documents/2170613130.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d6457404670---mobuwadigibedubup.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/81bd9b36f96dc0fbc47b085fbbb1fc79/fegipovixitaguxegifiwoli.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/17662092489.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/44323875192.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a045b6044d2---25881658537.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/442197da51709d85ea0424db6fb34a99/4061214171.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/45b8654445ecb79a501c24b02546898f/70819387749.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/13262999248.pdfIn PDF document text
    • https://nistd.in/userfiles/file/17574207687.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/voreraxezinotumu.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/51259785654.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/10037789248.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161093f2ae5334---7420263880.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/72e2065df706e96aff13e3fb356b8bc2/kenuxuvagedasazu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c7b467a54---pedisavug.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/22c29944b64151f3dec36a5db8f5d2e1/18871625060.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c4c1977a24ba96864f9dcde16d6472e3/3899486432.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160941ffebe104---42984593030.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/500c7d1c23ac576a630434757c3db392/89363761628.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/50897283197.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_off00036535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36535 17724 bytes
SHA-256: 3cfb60f3fd1f2d8543b4fd7b9f08b7ca7223878f711780962ca64dc2902bdac3
font_01_sfnt_off00039395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39395 11444 bytes
SHA-256: f2305c02a66068d53d0ba90ae40dd32838a0753633bda1efe6a13d11a975ac3c
font_02_sfnt_off0003ae80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1