Malicious PDF — malware analysis report

Static analysis result for SHA-256 843aeae2c17bd7fc…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 04:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d21da7ef9ce04d84753d64a90b8a8c11 SHA-1: 87040ad627a4b01d4e389db0c0584f869342382a SHA-256: 843aeae2c17bd7fc53ec130df1cca7fce07e8a92c37cc3499bed28ab58e1439b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple websites hosted on compromised CMS upload storage and disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered via spearphishing attachment.

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 http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/1456644702.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2476236a5c2d55cf0ded62c84a02462/rakofegifex.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/87403918942.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/finaroj.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/xudofaworikiku.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/brdceuulhnp96r5ocr9825b4mu/72580193132.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16151bdd4bfc96---63164113563.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/risidepizefisipawo.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/dabuje.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614761a68c7dc---sugorinigolinuzufomojep.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/wukomu.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/55400058647.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/wuwasuwoga.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20211004_0ED4FD4F8506F781.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/sapopo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161430e48e23c8---xasipadixuw.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16159532f8cd6f---mefevedikagulumovibelen.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/zuvuzifikifugatizenojad.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/48361338183.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vavokugip.pdfIn PDF document text
    • http://hidramaco.com/files/files/kolasanonixiwozoxezidisu.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/61797782953.pdfIn PDF document text
    • https://devisme.maxtis.com/userfiles/file/mowokedosal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=psychological+aspects+meaningPDF 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_off0000af3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 16328 bytes
SHA-256: 44439b81828deee6a31c963498ffbd8b0063bf7e9384d8226f0b0d861721a9e7
font_01_sfnt_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 10836 bytes
SHA-256: e5e6311252d3f0ab9954f4a819f1a3dd5b41e3cec533e1bc70d0b6e6436ee18d

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