Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f9d42934afff52…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 04:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3f8730d80e5a98aef2168cb004d27c9 SHA-1: 2b25a9c792e2814d97dbd37dff35468587cb1ab9 SHA-256: 90f9d42934afff5241693505f1b8c4b2bf17c65653590228e19f3c4db043020a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zotebomekozidugimute.pdf In PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903072137784964.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e03d9b6175---79047516087.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16154228fafe84---54308237065.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/16096088697.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/12433094884.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/4416960315.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/tevogemufen.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20211003050031.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2b511c42de45e7c8e502ea0192dc9277/72821576838.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/wuvedun.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/vilumenikidubimoviriparu.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/48344911707.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/kenorumipaxonelemopenu.pdfIn PDF document text
    • http://poliinc.com/upload/files/sojejovewosuxujusuk.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/94614900649.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/vafafurinibuzudokasizu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138d05435166---mogegifi.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/rejomiguzek.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/pigezilabawesiriralavoza.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/93149032074.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/81359986679.pdfIn PDF document text
    • http://letdentalab.com/img/files/49351458499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wild+horse+pass+promotionsPDF 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_off0000af20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF20 17016 bytes
SHA-256: 309b35764072a59ab49e288c093220741284706d795b88d459bd1824f688b1dd
font_01_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10652 bytes
SHA-256: 3c468cca613b5f6643b5938ee9379cad9a2d043bfd99fef2801680df07ca6bba