Malicious PDF — malware analysis report

Static analysis result for SHA-256 23816de1d632ec05…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 13:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73432fed3183c735f7bd8a13ccafbd5a SHA-1: b3aa888babb7a67725f980ff3bfc16daf5efa46d SHA-256: 23816de1d632ec05642dc97d5518e3a75aeb6737165e0e53e41b6f3630012244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests this is not a legitimate document. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript for redirection, and the ML classifier and ClamAV detection confirm malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://norservis.cz/files/files/tenikofuwux.pdf In PDF document text
    • https://km2804.com/ckupload/files/53444939567.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/boxuxovuji.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/19309538412.pdfIn PDF document text
    • https://campermagazine.tv/public/file/parezuregisaxon.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/jakufarixugibasodade.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/tizogomadamaxobixo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9b71423e53513329994947872d9e5acb/jujapivasolip.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/bugorenilosalivagenodu.pdfIn PDF document text
    • https://premium-house.uz/images/file/zilofugimitub.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315cf3aa90c---dazeboradokod.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/wewonom.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109112018153046.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/zeloko.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47db20513---sabepixelofofudobebirox.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/makunuwusipagafuxawax.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/67395642208.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/47947967305.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/sikeduge.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/45328586195.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/rolef.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/24c4e2207c34605e543c459cd3abdb05/72894413145.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/sowarofilesemapabediseni.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/46086938371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+super+season+2+streamPDF link annotation
    • 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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 17564 bytes
SHA-256: dc5f2e493e6bcc6ea2aaca489da5cb9f4388786687f9b586b2193fc53ac111d4
font_01_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 10864 bytes
SHA-256: 8f3d142c3fa15558b5fab783c3f6e7aeedb7c36214a51571dab049f8f3b489eb
font_02_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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