Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e908d73bdd3857…

MALICIOUS

PDF

65.1 KB Created: 2021-09-20 06:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f64a5862797c5d436b79a256bbc92fbe SHA-1: 575db9ceddb724caa9afd81094a8d04a959ae44f SHA-256: 72e908d73bdd3857122048e5ec6292386a1c756041b5b6b8be6dbc4ccd6b1a23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate it's likely part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5448

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=hide+number+on+samsung+s20 PDF link annotation
    • http://vesimport.ru/userfiles/file/dugikozaxutosuwumunub.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecec4e095f---muketalegonisimopop.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091117321173499.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/litudov.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/xedomonuku.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pepokasomomolaxam.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/rekagozeluxukaxi.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/93992453438.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161320a8aec6a4---63492489580.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/saligar.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/63206536889.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1c9d5022e844791100f636a41b5913b3/46789765176.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/27119493138.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/ruvetik.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/37915290491.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/baluduzowudesoxuzavere.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/26344336868.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/53998338676.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/muwatozita.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/47753929327.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7b401f83d503dd18c417959a5017ec73/91577447921.pdfIn PDF document text
    • http://parentini.it/userfiles/files/14905855344.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/memaregetojujore.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BD 16204 bytes
SHA-256: c2d011dc27795c647283bbbc5fede7054cc258d415b8f86dd75200cd51ee0c72
font_01_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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