Malicious PDF — malware analysis report

Static analysis result for SHA-256 543164c61ca9f19d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 09:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8863719e5e3c2c4b0c27ed69ea7b59ce SHA-1: d113a8d9545dff1bb73aad2c043db73ea14d7176 SHA-256: 543164c61ca9f19d8cb10490a206d4c0c2acb75a36ad2694191acade5de022b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the link farm suggests it is intended to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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=sanatan+dharma+book+pdf PDF link annotation
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/derudemaw.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/11716102275.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/rodag.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/kifarufojijuso.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/82880448886.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/lawofetevilefom.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c6ec4c14053755fb216135953f546207/58718037017.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/lizusofemusekilasixazurev.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/87ejm0bipavj841neb0bfoq1ag/12484221102.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/2812956361.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/64671621704.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/22438036328.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/76325903132.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/kawolipizebupupek.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/2681407642.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210909204508.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903105746.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/zokojemab.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109011136047618.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392faf62cbe.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/78158027860.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/12809368529.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/52813399494.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/24717194049.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/28421595569.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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 17348 bytes
SHA-256: 7e108a682d075aab1b4b0bb9d24817cc8b4424f0228f26cf374fb616f06c2dbb
font_01_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 10632 bytes
SHA-256: ce7612c3351f12598eb50e606ce1de8e733cb036a4bf47db100478d1eaecaf05
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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