Malicious PDF — malware analysis report

Static analysis result for SHA-256 360ec9eb3a5595e5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 00:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6acf37d0456c55494cd54ada4e7ca96 SHA-1: 9bccaabddee649c87626f2d8dd253cd8c3eb80fa SHA-256: 360ec9eb3a5595e5919ae4074a36b60f2093ce64598196407c69835efeaf5850
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a link farm strategy. The embedded JavaScript, though not fully detailed, is a common vector for initiating malicious actions within PDFs. The ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=one+night+casino+apk PDF link annotation
    • http://greenmodels.ru/uploads/files/18593896995.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/retewomefeso.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ead557fd---pisuvirega.pdfIn PDF document text
    • http://anindecor.pl/files/file/80986051237.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/54745115090.pdfIn PDF document text
    • http://chinahongji.com/d/files/mejotelusizorazupuwama.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/55936892843.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7ab48f6f---90781306884.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/dupagikopiguxozi.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/23310700320.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/17659789605.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/durodafipefifiwatobur.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff804ab466---66942508567.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fo2rt28duu77iusoo681sk7b17/fanofujogutotoxujorupevol.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/potogavo.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/68928826428.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pomebenufilejobuwitot.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/nugafoxuvilabuvaro.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/27620813974.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bf9a97e688b94b7bdc84770cb4d2d26f/22168302944.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/5421476964.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/94292725005.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109111202074850.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/pezomavifevagetig.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/72581254938.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_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 18748 bytes
SHA-256: f8c0918a346d15462a47c294b624cfbd343999257e18fbba92ec84d01c9b89bf
font_01_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 10624 bytes
SHA-256: 925c6943aaafd2978ca0d64aa9fa7f1a81845372ed873fc7a67ec9318bea8b09

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