Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d0e49f8d968753…

MALICIOUS

PDF

80.8 KB Created: 2021-06-10 19:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3666ae893ca8a29475a82980515363d7 SHA-1: 36ac6630e5a02d4daaebe4b13549060d64241e70 SHA-256: 50d0e49f8d9687536f817cba401b6fe997d3ef90768cea8853157f2f86391461
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9996

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://huntic.ru/uplcv?utm_term=beats+pro+wireless+manual+pdf PDF link annotation
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/68e6umko3l6hph6cvhpi6a1s00/21393675798.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89cd4045f---28666730621.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3lo03b1dn5o3oarr28amulls7b/sorabavoxabujaranixas.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f7459c1a6f2b00dc07c6185856f88c6f/kegatixina.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/sotatozavekevanozisukox.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ijjanb56tc9at04gb0fefm3m0v/vokive.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5dcaa731d0cf12a3a03116d7086b65e9/zudej.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6ujf2lkbj9c97uobp5hmkkb02i/71493536326.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0296b8c21e---465268072.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/75a2eabc14c888bca338007f67f5df2d/lonevuradesi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075e76ea2b89---90446607036.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97736285715.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/65019751958.pdfIn PDF document text
    • https://energooptima.hu/upload/File/tokopadaxelezokajevo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e262601aa---dovatigax.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 6168 bytes
SHA-256: 9f07a400e75c177e496f395344003d4a7545e118b36bf59d530d47f9bb3550f8
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 5212 bytes
SHA-256: df661a0b0525b4708868dc2a9a6c473346c6a33b0b56b287941cffb052a82351
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 10728 bytes
SHA-256: c53296129c2d7334cf023e2ac1089471156abc061e3029bbe5e7cdb63a37bb71
font_03_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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