Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd8400b9c1b9d47…

MALICIOUS

PDF

97.2 KB Created: 2021-07-10 02:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c4201909783af2076ba9ad00ab89e931 SHA-1: 55b644cc169e67c8a402022b5e0dc1ed96e593f1 SHA-256: 6cd8400b9c1b9d472992cb606a505bfab29cb1a335382024616ab94d97c2e262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=the+greatest+showman+2017 PDF link annotation
    • https://fcksa.com/ckfinder/userfiles/files/56724422464.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/bazuxopid.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/145e119d9a95235778844e1552e005e0/61443444312.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/crfmuhr1dpvkilbmeb96dega47/bizozusiwakiwadofuva.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd6782772e---dazojawotonezexiramapi.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/73202984702.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/kozapadexebigo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb329f92e74---zelavet.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2035ea9efe---pexugorurojidu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/93fd67f6a713c4337350299962983de4/gifurutorizeb.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd60ec0ed04---nafegetavasunu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/06b1e05a956e03faef9e9b40c0ab84c0/4295009479.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/089baabb5509fdc0a97b4b868c1c698d/4307922738.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6d832cff789d77626ad7e26ddf980c62/31148214498.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f74d8dd1e---lororirolopunomof.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4313ab7c6---64019037891.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/36020824102.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/12922494825.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/ce5920036c169d0a86edeffe0be3b824/lonemofanedofo.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/0fb204ad52bf6f145703490c11d9fbc3/14438207644.pdfIn PDF document text
    • https://zold-kommando.hu/files/35932196570.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/67624054867.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/83c3cc438b3c07652a05493df37a8727/36827481452.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 10812 bytes
SHA-256: 4b80e2aa3ef8e67efd053227b4255a608107b509a8354541d5ee280f529d91ec
font_01_sfnt_off00013242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13242 17356 bytes
SHA-256: 02e5ccda01f4ad73812ced45701d88c858c03c55f45a3d873308c0e3c59c8e8f
font_02_sfnt_off00015f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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