Malicious PDF — malware analysis report

Static analysis result for SHA-256 630dde9d1703bd92…

MALICIOUS

PDF

79.2 KB Created: 2021-08-11 18:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b47b81e140997453117d4d4abe9eedbb SHA-1: eaf71aaaa734029af1728ed1cc79742db487db2a SHA-256: 630dde9d1703bd92fc5a1a31c1f11760052297b85d1c2919e8cee9f7af857f52
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to redirect the user to a phishing or exploit page. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/dag5kk6nq90k3o3441lekeceap/51088538178.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb0b371eb---rominitajuleri.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2525e042---panajomimuwelakikimokig.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/49496365229.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6598b55aca26863e7fcafac21bfe605a/37142054648.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/63101da73b4fa039b8c8e6226fae79cc/61999657680.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/23341334482.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/42778489416.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/57174490571.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/lumilonupavuwu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b351010cd0c---26680718656.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/luvaruxapoxujezo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4efa1f19e---10144837073.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabb79312b---24108766313.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/bubadibedomefisazuvodaja.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/vitavoleduzidodot.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac25125fe---89382849398.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/814bd93cf27df0d468aeca6e2572c137/roponakalaw.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/betajewobez.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/32229203043.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/nifavopegusariruna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=moonlight+sonata+piano+pdf+easyPDF 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_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 17584 bytes
SHA-256: 7cabf9041588fa61a09072b767c195e904421a07039fe0911e63fc047e6dbca9
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10784 bytes
SHA-256: 3759608c6681855620476c8d12cdd58ea32ccff0a1ee77c47d4241572ccceff6
font_02_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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