Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc68da3b34157f1f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 02:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70114d0aab9000245cabd34ccc9321af SHA-1: 0a85a884f03329abd165cf6f39735f65f783b103 SHA-256: fc68da3b34157f1fa1b7043b39f059bee1892dca265b27588885fed5e3ee1095
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript is likely used to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=data+transfer+app+for+iphone+to+android PDF link annotation
    • http://mercuresamuichaweng.com/admin/file/25441952966.pdfIn PDF document text
    • http://gr-chem.com/upload/files/55646962988.pdfIn PDF document text
    • http://haki.vn/uploads/files/34122359881.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/18419629480.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vutidexademuli.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/92267876175.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/gesamo.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/fisizapomagunifupoguza.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109080252051456.pdfIn PDF document text
    • http://toonesk.com/upload/48836400229.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3ec44316375a243c6223ba564cff2c6c/63420465067.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/xuwudexulolivisagip.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/22754955185.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/zovanawelifefowogonomize.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/wamisi.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/pevijikojeduvumexu.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/talizazuwafigiga.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/92333360186.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131988114321---betol.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/sasoripejef.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/41067619749.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/m0avcbe2ml2ps3snh7re21qhsi/33303608517.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/kaxel.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_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 10548 bytes
SHA-256: 48595307c7924d5c3366f3fc17200dbba7633641f47edbebb9afca6adc6a37da
font_02_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 17284 bytes
SHA-256: 96f29083aaa149faf66e4d7503b712ae3e008fba95aebf338837c225d17693d4

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