Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fa2314d7c753a2…

MALICIOUS

PDF

87.0 KB Created: 2021-09-14 13:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c8228d7a4dbdaa6080b5011793bb926 SHA-1: 0f7c3e618a29160a247f94d9a6aadf7fca41ea8c SHA-256: f0fa2314d7c753a2bbaf9525b703d1e3c05f6c0c9025ccfadb8c547139406896
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple URLs, some hosted on compromised WordPress sites, which likely serve as redirects to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://radiosmile.hu/upload/file/gadozuvekiwarefofi.pdf In PDF document text
    • http://thaiboxes.com/piceditor/file/88048304423.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/bidonuxevivufabi.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/63173262200.pdfIn PDF document text
    • http://wenxuezj.com/images/File/9618012624.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/83763949971.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/golemetofamejomi.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/83553808230.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/88661481134.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/22066361792.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/a547f8e5d6d03e3f4dfc01d35e624cd2/3343307348.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/90337348449.pdfIn PDF document text
    • https://tckontrola.hr/files/95074523460.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/rogitarugelopopaderujixeg.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/57279506702.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a315d9bc---kodatipudotigazegagavi.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/51631972828.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/soropumarezukinurokutiv.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/98715650480.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/kufetemifipiremulesuma.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0439fff35306a29adb40740ae072849e/42761341161.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/kunix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=apps+to+transfer+data+from+android+to+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 2548 bytes
SHA-256: 3846ed08219e63b1d80c2b8f4986b99314ab3c6adf46b46607bb3750336d4127
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 10592 bytes
SHA-256: 33c82ae3ad18fa766ac3e86372b7c87bba0ed8e4790be8be2860ae9cdb01cbe5
font_03_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 17276 bytes
SHA-256: c498be8ddbe0abf27b9b5428e80d208cec4e74a684cdf09dc5042f6c01dddbd1

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