Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37ba8831f6e8530…

MALICIOUS

PDF

91.3 KB Created: 2021-07-24 06:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 35e00ccc7a99ac2ee9f14da5398d37cf SHA-1: 0048495f5c2ec79d51ff90deda1fd3a230daad4e SHA-256: e37ba8831f6e85303e5329d159b3304c6a5d044a6a14b543e9df5a1f182921b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://sporyolu.com/resimler/files/12314319174.pdf In PDF document text
    • http://millecolori.it/images/file/xenokilof.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/27o82lcm742rhf3rsb4pem4dv9/tutidik.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/pcecsuuv5mov2sq1b5gnkj2pqt/medurobifopawatevagewiz.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7844a563b8---2566447937.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/53819051610.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/vidazodufuled.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/daf88d717ef98339fc3219d4bc574f1a/lixijuzakulesusoxovuro.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/fiselaximovizinofedinu.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/52538738805.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed680c9082---gasilebesalizonapunalosu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9252cd9e---siputuguluzor.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1b3963757---vixuredimixujox.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/53628766012.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/latagup.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/rumerup.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/04/68474052781.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/bawuwibiketexotoja.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/naforaposukozavi.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/12593287338.pdfIn PDF document text
    • http://brukbet.com/user_images/file/71633319842.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fdead61a1---jotawobidawakowebivu.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/17105713071.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/33602861353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=problemas+resueltos+de+distribucion+exponencial+pdfPDF 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_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 18888 bytes
SHA-256: caadafd24fea9b82317c0f821cc094e27771f91892c0d019266ab12e97ef08f8
font_01_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CF 11124 bytes
SHA-256: e01e66307eb12dd478e38f32f040c901a8361b2947809d89cb6a1984c46019a5