Malicious PDF — malware analysis report

Static analysis result for SHA-256 48edb6f7b131447a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 00:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 836fdcdfc3137773e73c7ba16f65e04c SHA-1: b6f8d2eb76ead8ea00fd93cb814a4ecc12c9d200 SHA-256: 48edb6f7b131447a0b1dbf65b8e5a7108ddb032c7f0612de84f932b5d32b9cc7
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://datajournonepal.org/files/jibuzijewupapegelo.pdf In PDF document text
    • https://thepainter.asia/upload/files/tigonimofejebaxibij.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d6c3766b3---85521300539.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/1d7da2b8443be4a0d7c0dfdfbdf0f259/19165991777.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/4810184112.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b906ec9e594---tazenopogibobuzen.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fdd58354b---kodejuvu.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/nesaj.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/27/file/20210527_175035_165.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610faac29ba16---zagobewaxes.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/j8jrgv530fjulmh68c6g4q1ta0/52866204908.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16096a70ca9cd9---99352270126.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/dixiladonujiz.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/45889480373.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/da6d38df17017c08acebb29bd5eefe95/ketapod.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbbb34f5a7---4301041796.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/77777924545.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/xedetimobuf.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a983509037---kabipamojujavaraneg.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tfsibafoiit47gvkve31758jmi/jimabi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4ec4mpj3s09ss6lekegju3pah2/mapap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=buku+ii+peradilan+umum+mahkamah+agung+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c69cbae5399a687e635bf57426e6f446/forekovixubududobanipafub.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_off0000be27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 10804 bytes
SHA-256: 66d210b38a86e2d0b0b5b52e341390ad2595fb9914adc1b3b5da42fa163ed46a
font_01_sfnt_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 15924 bytes
SHA-256: 6e5fb105afc5fc707369c25fae44cdf7f8bd3f1f3fb7ad351a1ed84ac7be9b4f
font_02_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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