Malicious PDF — malware analysis report

Static analysis result for SHA-256 52650613f5449256…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 10:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6c4c9fa6a934b5fd58f0691b63d2ab95 SHA-1: 9ca08a6f089b6f9a4719e7675e7b8854e7f5239b SHA-256: 52650613f5449256f76e9e0f2fbce07ac0b097c1ebce558118c98c47ed49c321
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic firings indicate this is a link farm designed to direct users to potentially malicious content, consistent with phishing or SEO poisoning tactics. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=microwear+l9+price+in+bangladesh PDF link annotation
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cfa4f7e6087dd90f18aa1f462730b89b/98671223494.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/19543795129.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/48705970550.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3510uq6lr4bg85o0kuvb0u06su/93872117793.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4cd260aa6---kulaxoxorepefefeb.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fde224247---lajixuzetiw.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/63260243087.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/fawozakod.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/31510228666.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/77382347564.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de3ab1aef9---85948570897.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/kegazazaboluzonivo.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/91066541708.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/93137601183.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/nivodepawurolowezu.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/zipitej.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/98595485918.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/51776722368.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147179ee643c---55092102055.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/sodison.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d180850381---subixowiragikanokafusata.pdfIn PDF document text
    • http://leeandrewdavison.com/download/rolixetabejegedu.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/viwaxidozexamipiriw.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_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 11080 bytes
SHA-256: 83c79ce58acc4b4eff92a83fe3d5b61eccd68119cb3c4b03a46aaa6c965e3408
font_01_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 18680 bytes
SHA-256: 75ce826a51472af45624426e90ad7fd9941a3ce9a996881736fe9abba7300d2d

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