Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11943c10ac72f3c…

MALICIOUS

PDF

78.2 KB Created: 2021-10-06 12:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 55763b5e2a10ed3fa45856e6cf00d2a1 SHA-1: f17d64aaf52cef8b1b1c280cb1c9e8d18f460d54 SHA-256: e11943c10ac72f3c56098dd53295fdaed80b4f72bb0b4c539a02d3e5c1fade01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The embedded URL `https://chcial.ru/uplcv?utm_term=cheats+star+wars+knights+of+the+old+republic` is particularly suspicious, suggesting a phishing or malware distribution lure.

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=cheats+star+wars+knights+of+the+old+republic PDF link annotation
    • https://cap2013.aseat.fr/userfiles/file/34685704445.pdfIn PDF document text
    • http://ccadl.com/files/20211006131223.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/33351567617.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/27797218248.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/bibamelibitapegajaxawim.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/35814316933.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/tapubusakogajexiv.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/fokekumodigaro.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/26737219768.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7441d856dc67d3fabeb6651d0bc1d672/98880955983.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/pisiretediruroxemidezizu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced50bc1cd---69333178598.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9a9a6a3c4---weniwize.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/zedowiwabijuluwixamalewu.pdfIn PDF document text
    • http://itena.si/uporabnik/file/47036179322.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/vubulotewel.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/58302327092.pdfIn PDF document text
    • http://alkanboya.com/files/file///52026021986.pdfIn PDF document text
    • http://edeins.com/userfiles/file/vugexifimajamenodas.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/1f625a4c83515f6567ade5da1395af7a/48676565025.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/jerum.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/15732214381.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/baxofapisanoxasamotate.pdfIn PDF document text
    • http://ty-int.com/files/files/vilepodixasanekatanomod.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/61926213665.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_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 11348 bytes
SHA-256: bb84241a6de4b0cd9beab5452fdc764a0a139c40409cc32fc3348219f513cd10
font_02_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 17736 bytes
SHA-256: 5068e02ca71cd071d0df52cd379538268dae2e7756bea2896a7ec0c095b3d717

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