Malicious PDF — malware analysis report

Static analysis result for SHA-256 21698f9f77634e78…

MALICIOUS

PDF

85.3 KB Created: 2021-08-18 05:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d311a958266607abf0a4d67fd5e0090 SHA-1: 115c6f3bcea5f01671e5ba7da4d6760842e209ba SHA-256: 21698f9f77634e7812f5f551d8406735dc33e43347298a0a1860960894cbb41c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1d457a3e---lupitanuk.pdf In PDF document text
    • http://www.victoriousintl.com/new/resource/files/61160521582.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/74442724212.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/28e36e996a6d57b98d07aa50b3c44cff/jikujig.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161160832cc1e3---vakodikorifimikopas.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2288441437a942557145f4c87c2bf02a/74530378772.pdfIn PDF document text
    • https://termofriz.rs//files/62899754892.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/63400264080.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16114cc89328b3---sedumepudejoledapopan.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c732c1ec215---15321068451.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c8587c0d7---86257339209.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/nuwozub.pdfIn PDF document text
    • http://machin.kr/userData/board/file/xikitapasalodaxuzika.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/pawolifej.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9186642316917cc61732df933742b6f8/kuvejurafarogu.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/meguwapi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160864c15d7b88---wekadigukesazamuxisuvewe.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/6848465756.pdfIn PDF document text
    • http://gkia.org/kingkong/userfiles/files/jotuxirenafoluzisamit.pdfIn PDF document text
    • https://nadamasristorante.it/file/penepepuvos.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/wawisedujomemasav.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/vusuxuput.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/11303069704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=formato+hoja+de+vida+funcion+publica+sigepPDF 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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 11480 bytes
SHA-256: 53eebef2a91c54e7fabb63ef7ae9839cf81533056a1a0058b4af92e6fa547e0a
font_01_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 18016 bytes
SHA-256: 23450f8cc0b6f2d123ab1f27f7a497b651c28c538f21d63986e0b34aed7f8c76
font_02_sfnt_off00012cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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