Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2399bd5cc1cafff…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 04:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76c7013f3dcd3624b8ef8eb09bdf8690 SHA-1: a7e9acf91ffcb7b382ba921f9629d08f9afdf056 SHA-256: a2399bd5cc1cafff19ad2c2f21076626f816a026a8c622ad932804de5237ec33
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ilovegabal.net/fckeditor/_upload/file/99714629953.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dvh42b39jv6t2vml2aq165k291/kuvutalexejof.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc5c6f35d1.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14216e6426---24538660495.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16115cbcaada8d---15347800605.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/kuvakexuxotuvujopamono.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c94f8ee74d4---wewogizijumatil.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/rasezinidavobedaxobezarum.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/47108235806.pdfIn PDF document text
    • http://lse.hu/userfiles/file/kemolawafifedekurubatalex.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b6dc77913e166c6f7e0dec3ef5926119/ninexawurixinodumux.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9m1bntsmvk5h6tg2mer2sfb656/saxezititolegidugegub.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/wotugapewikunik.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/90470223276.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/68356080107.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533028a1bd---74610618616.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/28946346567.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/rakexof.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/kopadup.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/99893279912.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/47763466040.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/lebekobasonowaxavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tagged+pdf+formatPDF 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_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 10392 bytes
SHA-256: df0ef816030542c7df952d4bdb9e7cbbbce9f3bfc2b050125e0f964b09107fc5
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 17828 bytes
SHA-256: a45be89abc3da4ea2f8c5158a4d4916bcd9f9f7ee1a2596749591c81dce0dc31
font_02_sfnt_off00012c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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