Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05bf33d74950522…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 18:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 175576e4b1bdc57523a629df67e84fc5 SHA-1: a74ae1c7d0bf597af12d1ed7cfd74a8abbf20e7e SHA-256: c05bf33d749505229ceca435418af5476faa6c10152e3a12b8822808df21aca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF identified as malicious by ML and ClamAV, containing a link farm that directs users to external sites. Several URLs point to compromised CMS uploads, suggesting a tactic to host malicious content or redirect users to phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vetusmeter.com/images/upload/File/19359334445.pdf In PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/lipimesevumumufijokovidax.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vigadorajujo.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210914154842.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/14266083100.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/rubunevoduxinegav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d83505b5---64625567107.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/jatokurasu.pdfIn PDF document text
    • https://hobbypet.cz/files/file/gedibigitar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342243f37b6---bevut.pdfIn PDF document text
    • https://birotex.rs/images/files/13654446586.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/sugazos.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/36762958883.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/puregomonok.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/29648807645.pdfIn PDF document text
    • http://awards.nl/img/cms/file/jotetodejoposobelara.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/bemopuxipubunuf.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/95171364882.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/71044441331.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gaxoguzosof.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f51b423984---sodizu.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/18969594863.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/bajebikozugideke.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dnkk21i250u5opbrna77gnjrhm/tasidifelawin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=alien+covenant+full+movie+watch+onlinePDF 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_off0000d628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 10564 bytes
SHA-256: cafe96dd921b995dfd3bdc28b2048dbe09261db4174f18b123881cf436b62335
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 18004 bytes
SHA-256: c1b18d214a08d65a23fdbd5097ddcbcdca7b3968b5dcd6ada4246e8947631a0f

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