Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fca8cfa13e4c2e…

MALICIOUS

PDF

89.9 KB Created: 2021-07-13 01:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84f90dcfb2a6cf3fbc5d7f6a8e8beedf SHA-1: 0a55c4081074f6059ed07f9448d9850aa951009a SHA-256: 10fca8cfa13e4c2e87c4c545692b8c480ce62d01a7795918556adc38d37acc15
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript which is a common technique for delivering malicious content. The heuristics indicate the JavaScript likely redirects to external URLs, some of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://irlanc.ru/uplcv?utm_term=captain+america+thumbs+up PDF link annotation
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/34d868e0fa889cf8b6f6b867268da4f5/69275908822.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/nebudotipibisufarajemun.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3f8741ad376abcec25d048823faac07/91110094165.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/2ed4118738c722f77cba49d79c72aaae/73624342858.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1094a8119fa190f38ec2140d39285e25/72549992915.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4mgtnf5v3q3jl2edevv0d6m5b8/10795944995.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210615030101.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/5259536982.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/poronazimuvaraziloxodux.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/ropuzanuwoxofi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/hvjhj130r9m765b68gf8et6gjg/62266420477.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/9627354959.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d390e12efcd---68007622281.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c203e879f82---gisikuvuwebakapuli.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1e3a610f---64144660912.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/zewotok.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/34831198561.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/39ac7167a1ca3b015dd4d1e39496687d/tigam.pdfIn PDF document text
    • http://www.polni.si/Images/files/gosaz.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/eb5ad69d398efc140734caa142f339c7/49300934651.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/valokofufiduxazored.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb8796207---xagitonagikesotebag.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 10744 bytes
SHA-256: c7ff0504d1d5651de5d5226668c647715dae864247a4b6a1378af6c11afded95
font_02_sfnt_off00012c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C08 18436 bytes
SHA-256: 3195805dd017414c4c34681a455e25da0ac7ccfea895cebf46a00bac0c3fa433

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