Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf69c9745f431ca…

MALICIOUS

PDF

76.4 KB Created: 2021-08-28 07:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc274d243f4184b0b60573e861a3f922 SHA-1: c49cc7a2925b0a383ca6d7cf0f902901656535e3 SHA-256: 2bf69c9745f431ca0e8a24a6cf8800833f4926a9272a049b1b5b739d1a9accc9
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e43657ab---96730195482.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae0712cc87---faduvadowudukelogejoro.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/7597181085.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/47251282692.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8619f04597f0a1b809bef0872ae19e6a/16007123960.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/6625079102.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/beberozebegapip.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/degokizuniralejakijigin.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0bdbf0a6580607f44e68e8d345f903ab/58072905659.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c3ff7822b5f93b614f68b110cb7981a6/fodegafawemiwugetabif.pdfIn PDF document text
    • http://fxmeat.com/upload/file/6bd85aeee1b227b6c60d054c860829ed.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732fd02f795---zanape.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/jevegona.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16105c51a806f8---xufofobuna.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/53207195950.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kegowu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c362e0110f83670598bc44ca5fc0edc6/tutoxesa.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160705088b66be---24363493674.pdfIn PDF document text
    • http://cwesp.biz/upload/file/62434143390.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/fa9c3103c1a266ca7d8ebf6fc598c00a/gevifomixanuni.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/66513231327.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/xapugi.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/55300278681.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/185586963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=equation+to+find+gradientPDF link annotation
    • 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_off0000c43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 18144 bytes
SHA-256: 70122b9d1ccbebdda189486657b6a14f787f72bbf5f8402fdf2b70d98c6ad72e
font_02_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 10544 bytes
SHA-256: 17615dc5ed113cca3edcfd27004c479c87c015b4a5b738f7142dd50184f03743

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