Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0cf4dc2c7b6e72…

MALICIOUS

PDF

93.5 KB Created: 2021-06-11 12:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 50ce73d7da9879d9b935519f41a66da0 SHA-1: 2d1d81d50247019b02fc434398bbf1f6f8641f81 SHA-256: 8c0cf4dc2c7b6e72c4b81bf14e3c13bb68c13edbe5c9e7f4a876de85f90429bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. It functions as a link farm, directing users to download a game via URLs hosted on compromised WordPress sites. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=attack+on+titan+tribute+game+android+download PDF link annotation
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2dd0f0afcfb12811957fcb5808e855fe/93175203711.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a37458553---79008926887.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/bda2d7f10e1f0896c38d4a1d890da4d6/nubojujukusad.pdfIn PDF document text
    • https://eternalbliss.net/file/mepadawevuladenaguku.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/633b9mukdhs02d2vd1o34jlpp8/82182470964.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e32e9db9ca---6861748105.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4182154f6a---zawutabipovirizazaliledo.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/iie6sngc73et5v6hn0341j144i/72252078696.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6a5f34db797a559282380f6b9437e499/28802638093.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1ff44ec7---46434765723.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607419a7e24e6---lilanexijifuze.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f809ee2a67eb0cb9a2a7ee3697a1451f/jerobuvazigu.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/3tb8ant0hi65noep74bpqp2j36/rijaj.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/89457049061.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qbsms9g4pob2167l0ef3u035f5/20107349266.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/pitodikol.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907065ae1ba---90051264511.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bef01b6130d---417323709.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160801ac2479b7---taloli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 5368 bytes
SHA-256: b201f3907444602e68d4e3bdfc83776eebef7511f60d36e2665233a57f3912ee
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 14424 bytes
SHA-256: 405b7b2d863a7ec1d3dce293ad00242bb93eabe6652fde1f329a99ab0ca3c3d3
font_02_sfnt_off00014592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14592 16244 bytes
SHA-256: 378532cf19d23c2ed7f1f2ef91d4e5f327875976a7e74b4e1e59da361d1ed4b0
font_03_sfnt_off00015b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B4F 3220 bytes
SHA-256: 0513da2d14f9c410b12a76ea95e64d2f99e7609dc83b3f213a76d060194a465f

Open this report in the interactive analyzer, or submit your own file for analysis.