Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff819f5d4527c4e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 06:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9c7caf18ca3aa1eafad7244598393b9 SHA-1: 155f0e58b701eb485ead9da28ddbf3ef65c0914d SHA-256: 5ff819f5d4527c4eaecb86dd8aec1ab511585568efdbcd561b2daec6ca9062f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for malicious purposes, likely phishing or distributing further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=8+ball+pool+free+coins+2020 PDF link annotation
    • https://cardolf.ro/files/42182894122.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9f51bef5ff7145b947a7a647cebca035/mekaminuwujaja.pdfIn PDF document text
    • http://mutitar.com/user_img/files/75869143309.pdfIn PDF document text
    • http://leguido.net/files/nemeluxunofutaxefumazepav.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/85965304253.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/386444168.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/sipatidumi.pdfIn PDF document text
    • https://arendic.cl/files/fudigewoferinu.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/rapupibafoto.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/nikazuzosasuxe.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/vosujozenofiwu.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/90557842729.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/72385269942.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2bdcbf686---54022123222.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///42079071967.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fd2edc113f1d63945071d1712db54a12/4538174083.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210901165844518564n1x2243mn18d.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/80337314716.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/87067858639.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1ae69dc7---64752347174.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/97787041993.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/84599775592.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/wadodavifukipizagubewobu.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210907094540.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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 17924 bytes
SHA-256: 00c130ad0dd0135b4d956fb5893fa53a4b32ac0bbb2a2bf4eadb683f22fa8c1a
font_02_sfnt_off000128c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 10868 bytes
SHA-256: db91158a7b351bc68b5daf3752f0e0f23e2c38d598e6839e05b9dc8fb0b23f84

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