Malicious PDF — malware analysis report

Static analysis result for SHA-256 54368381eae995b6…

MALICIOUS

PDF

85.2 KB Created: 2021-08-18 00:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eaf9f36cddb600b829ed1580a3fe78ee SHA-1: 1f7ec97425670df3039bb649284465c364c11283 SHA-256: 54368381eae995b65ffd3ab0c88ceffab5d921b4ebe409b08b983db93566b4c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88a487862---98459876409.pdf In PDF document text
    • http://mamaskitchenorder.com/uploads/files/lonetalotonuvil.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/bomamigokare.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/buhp2s1h9v3u2vksq97gis2h6o/43536735817.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/19597165289.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/xigudivubovizipog.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/dununamiditidowesa.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/zuwowa.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/korokogiratapot.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/25566262679.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/721d0220f1df237ca27dccae13f1e94d/61706417346.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/34083410931.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/wefutelamufijitare.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/kufosijigilanijel.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/97625438198.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/jexeleradimetogo.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/luwewowujelapaxamikil.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/6566357788.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d0bc5426a72f53dcd59b92b25c653d78/90623891406.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/80655124963.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/kepufejomifanuwezusiv.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/mobukasefexivagabi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/30jc8tt6708q27p8reqp77k290/fuleg.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2db440afd47c4dc0bf0167592e470f7d/tupawowemapaweg.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e160f7d03db---movirisesinevitat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+comprehension+worksheets+for+grade+3PDF 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_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 11348 bytes
SHA-256: 69998f1c2637cee5b7cef5d8f64c4a58be9bd791edacf91f3640e5740a5f9ae4
font_02_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 16668 bytes
SHA-256: 775db5eb731154ad877a08e948daf76f5fef4669c4b936ec7a7ec5385b8bec93

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