Malicious PDF — malware analysis report

Static analysis result for SHA-256 2799f48a8e892d8e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-15 17:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0175b1c61cf54231a99150d4271b44d SHA-1: 2c79c287576ceb52033f5de9fdddec3a3a54b55b SHA-256: 2799f48a8e892d8e8c1091f24774d59bffc19bb8b17cab0e6ccb070d1abc6d2e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicative of a phishing or malware distribution scheme. The 'SE_INVOICE_LURE' heuristic further suggests a pretext for user interaction. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nomylo.ru/uplcv?utm_term=gas+to+liquid PDF link annotation
    • http://samtle.net/ckupload/files/83839312809.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d0f78d5e---nifepuvorugepuroki.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/37552436674.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/47804920109.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/17449322569.pdfIn PDF document text
    • https://mlspoland.co/files/file/bozavinagibifazuf.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/nabewip.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/tirexisutafewiwutarez.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/mizomejujaniv.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210904023243.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/25849914729.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/juzaboxexabibidageweju.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/71764343018.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/82772685591.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/79357666551.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/1179d4788e0178addc0e563406b11e86/93944243203.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dojapiwagevonipekok.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/pumipelofuvunexebadofit.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/72582596131.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/28048296714.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/99119566864.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/66166076766.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e981f336ca---84971300749.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/21068114580.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_off0000ca3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 10192 bytes
SHA-256: 99bfdfaa9e0be919227fa70c7c85a1ce09a5e0365fb445bc008f124acc619e08
font_02_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 16908 bytes
SHA-256: cf86773d64d860f1b66000805ad7215627a7be4be07460143e3208e7fac92e09

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