Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb43d47ddd69ce5…

MALICIOUS

PDF

85.1 KB Created: 2021-08-16 09:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dd9fec64a82c67f0ff08c555431e94d SHA-1: 62cc4d4de6da12447435953bdf27aa11f24676ae SHA-256: 3eb43d47ddd69ce57422aafaff8549ce973a9155e01af18105d19b826b87c6b6
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 websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://archism.ru/uplcv?utm_term=far+cry+4+trainer+fling+v1.0
    • https://majorsagilekvaros.hu/uploads/file/gejitadekiluneta.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/5187956415.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/ragumeturijaguwo.pdf
    • https://agrilaui.com/userfiles/file/fopabokegudavejop.pdf
    • http://ampletrekking.com/userfiles/file/47573650908.pdf
    • https://ibeguiristain.com/userfiles/files/38625928880.pdf
    • http://langeline.com/ckeditor/upload/files/66886526573.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/17275837082.pdf
    • https://widepolymers.com/userfiles/file/fazokugakiwadogakefale.pdf
    • http://zwickerfoto.hu/_user/file/sotuvusavox.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e1342b79---jufojilavexufomopiwu.pdf
    • http://cokhiminhhien.com/media/ftp/file/14083923635.pdf
    • http://jandenzobv.com/image_uploads/file/33606362533.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c97de3eabc3---34516578658.pdf
    • https://damsindia.org/admin/uploads/file/takamodoxakebujaged.pdf
    • http://kursadowicz.pl/Upload/file/toresixiworaxuxuvesor.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/149e4b32cdbb2a177d5d9bdf3dcb3d15/nuzadexo.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5153bc69a---jejefetit.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e1d9bbe3---25308293633.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16074baf53ee0c---73048199267.pdf
    • http://healhumanity.foundation/userfiles/file/rategeseduxenepoxa.pdf
    • http://baobiachau.com/luutru/files/kolivagixe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57f.bin
87e2f2e25f33eb3ccc2f69a49917c661189b0e33be90a327f3cf33f021a33910
pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 18112 bytes
font_01_sfnt_off000115de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 16792 bytes
font_02_sfnt_off00012df5.bin
4ca319f966cdd667258880d54e6b805abf511a5ebc15ea674405c19f4c768a7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF5 10696 bytes