Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa4004e181eb0b9…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 06:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a3aac7346c2d7e7ccfed5463605dfca SHA-1: 242df50ef059368d83c4453f83024a02498277d7 SHA-256: 9fa4004e181eb0b95ec343ee28b6ab37b845b1115c356178d9bdb30cf645ec68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and embedded URLs point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f30e717b58---kibilakifosulururuzuwa.pdf In PDF document text
    • http://kronospan-mofa.hu/editor_up/fafizu.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/50823105362.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/luxaxakemuxi.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/23010664869.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/8513389420.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/gazuxobazujijixosi.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/pelekedix.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/92784080288.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109071701328829.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/xexililavufopinatunopevi.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/06/file/20210906_042607_113.pdfIn PDF document text
    • https://mangallagn.com/images/file/91577786840.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xozabamidujiroviduluw.pdfIn PDF document text
    • https://brakos.it/file/peritatekikuvexefuxisogib.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f399417957---gofirovapokobutira.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/pemiwivalibadupubonasegir.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/98625133408.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/90672534189.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/806b6fa55ba787a76d0cfec5a5198de7/23167235440.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/96540707932.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/82ac843e10ae146e586e15cfbad59e95/41729441892.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/21624531381.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u84ehb6736kv2pftmdg1389jj2/39519214322.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/jadusesujoxegoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ppsspp+gta+5+zip+file+downloadPDF 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_off0000b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 16564 bytes
SHA-256: f06a3303105bef5428ead0913f4ef3b4c0825efc115ba82cae2273141231231f
font_02_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 10856 bytes
SHA-256: 173e8c16adf6ef80199ec04357f35ded394ba9a23f260e99130329fefc077608