Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c0854653552782…

MALICIOUS

PDF

86.9 KB Created: 2021-08-01 05:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 149a1fd7285e4e598cfb1beff7b967b4 SHA-1: d421a0cf867dd22aa29fbf6c76f4ce8e75134f0a SHA-256: e4c0854653552782e771ac9bec7df66b45f320d406d2a6e6e65b9e22fc99a58d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised or disposable hosting domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such documents for SEO poisoning or to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://isagenixmakessense.com/ckfinder/userfiles/files/dumetelodofofasepev.pdf In PDF document text
    • https://soechi.net/userfiles/file/14190960259.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af7a37a78---mabikerokotir.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f3a24fa62cf251a3b87ac255ae55c2cf/31554116500.pdfIn PDF document text
    • https://mvservice.it/file/84272671299.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/59349a97a8ca7a2b00468eb41e714d66/51540205131.pdfIn PDF document text
    • http://matras-devison.com/upload/file/nuroxevokoj.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6c61016cb3860e46541a441d3ae7f0b5/27283110705.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/23936575849.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/tulaguliraxevezowuga.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2428baa8d---91522136447.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf90ded833---taxik.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/80420538050.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xikosojokezodib.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/grbnik8o6ftkhacte15kf98472/55335984192.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5117290336258b2b409c2a217f55bf62/52659834014.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bee4lj23ugprqh288d6to99ht3/dekerelidivari.pdfIn PDF document text
    • http://julianina.dk/upload/file/sozamiposezexoraxa.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/saliferasakodalefeta.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/xifozolasubimoguferupi.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/721707d093c8dfcb8f28013baf33f2a8/88655315150.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/18259165350.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de0f74264---wegebenusowovevevilupob.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55db15b97f---51563820767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cuentos+de+autoestima+para+ni%C3%B1os+pdf+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 11132 bytes
SHA-256: ba83798b050df947e57468586066f3b38f3ca60338d30bd1c23b1ec885661a31
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 17748 bytes
SHA-256: 93da753b6f572e5074a3e9deb8c1222d94762525d113e64a6add251c9d260b49
font_03_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855

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