Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a855a2d4f3a1ce…

MALICIOUS

PDF

88.5 KB Created: 2021-08-10 06:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a68a0c7ef662e60ae354171bbe74f8d1 SHA-1: a0e6115fb62e4046aa72229bc36adef1d1f656e7 SHA-256: 32a855a2d4f3a1ce22faaa61d9d21278957a872650b2b7e663955462ba4574c3
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the PDF acts as a link farm, directing users to multiple compromised websites and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious, content.

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 https://cructi.ru/uplcv?utm_term=best+offline+battle+royale+game PDF link annotation
    • https://ms01bet.com/contents//files/4622110992.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7d75dc45---70901949021.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/98846369229.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607847ea22aa1---dibabejidesajewimugupixi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4ee4b601eb76ccb440ffb1b3bce946fb/rapofajomesikafofiba.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb2011c076---89238729624.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/mudomegovopanezirili.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3cgqd2sdtgk0k4dch25vk4rvr2/63630680410.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/80b72bb54a0d181b70f2bd59d4811455/15083904565.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691a33de2b---22183696684.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/nudolutedararokulukijin.pdfIn PDF document text
    • http://elm3rad.com/file/18242719940.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/bemaj.pdfIn PDF document text
    • http://myesen.life/userfiles/file/45747945406.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09e0f1f39f---luwemagipujowaberoxonazet.pdfIn PDF document text
    • https://hgb.se/filer/file/74704463291.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/287179115.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/50857744670.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/61673034969.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/568748c47c7ec1d57f72b004ed5c7c13/87516872282.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/89186108269.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/rowiporefovadelom.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/zurasawidakukulizolevaba.pdfIn PDF document text
    • 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_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 10864 bytes
SHA-256: b7bfa4ad89f71ca0e0f15e93c1521dab69aa224678b01de252dd88dfd6fa7cb0
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 17516 bytes
SHA-256: 46076d530182430497b5913c00a6fd68c2329266265d2a44ab15fba3eed55874
font_02_sfnt_off00013a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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