Malicious PDF — malware analysis report

Static analysis result for SHA-256 24576a014c86c2f0…

MALICIOUS

PDF

86.1 KB Created: 2021-07-07 14:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8bcc13a971731ed573dcfa8545a69d25 SHA-1: ecdf02c799c2be94d9a2a07cc3d10a1e8f8ab54a SHA-256: 24576a014c86c2f066f35180a04b69de20e41bb75d5ff3487ed5df7e4fdac284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and links to compromised WordPress upload directories, suggesting it is part of a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://catamma.ru/uplcv?utm_term=maths+multiplication+worksheets+for+class+5 PDF link annotation
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0jguopn8nq0hce0q4kmh5upog1/93432273699.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d8127c66d25023786a4a0c3e8b9170a4/29047671523.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6702195130866fccb59dab35eafd151a/75259493821.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4d72c91f---83784333501.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/9eb7272204cb419742707fdbdfd64800/tuliku.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d849cc2581---55828228470.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de625c95a---67749272041.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/woxetowajisurabirujiti.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/nokadijetunezaviji.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092554649427---42022294210.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gobodewasaresipu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fdr66b06ro7rhtcd7bh29hvbbv/2765600877.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/60528715580.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/89722375085.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/12f8c30c7883d6b393ad7efc8e894819/13318793721.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc22c1e9d1---sisuxujavagiked.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2d6mbg5o3jhvo4of4iu8pvim9c/95413012336.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/moxos.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc9ad04da3---pifosapegebos.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/277d3a2ade4acdd67ab26e40a2b6cd87/75404825286.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/pakopomowedagovenuk.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/76258079181.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/49c677c447fa670a485b9f5b1348df38/vuvolutisevavojefonowafam.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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 11148 bytes
SHA-256: 431b6ac3a96c7522e09323c5352baeab260b9066d7f0054a6cede661cb327edd
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 17300 bytes
SHA-256: 58791d1b670500d6944edd4ac1de7a8ce6f16f8833986418eeb5609c3cc5c1ce
font_02_sfnt_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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