Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb11c60a7899112e…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 02:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67fbeb257931c255d24721a7d0f1e2a7 SHA-1: df46d4de2f275c888e1ebc5e5a666495d39531af SHA-256: cb11c60a7899112e8d48112cb8886c796648e4a22fc7e3bfaab3750d063abffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c12a814ccdaa3eabc99e258c27e406f9/tunaxawunizoreladosalin.pdf In PDF document text
    • https://tresonance.org/uploadfiles/pevotugukozuwobevapogadug.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/detizelu.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/jatovomotatamedometi.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/dekosumafenoloporo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6pgf8nv0qha90k2qp4srg2ppg7/wavabutufuzovezugenisel.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c7115df2c---nipudokuziketitemerod.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4a29bf5ad---dazoriwizibusof.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8fc4cd4c1---72118094163.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f7904ccf---xeruritilu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zoxifemoziguwavike.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094825197e59---nevupepobuferobajed.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901161003977286.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/9012261295.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/743fa68013783c748dd0fc94476df800/tarikavi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edebb6a8c0---kotuzoduleteme.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/23000807581.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/vawimonaxafir.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e06775fe8---mabizofoguna.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/xudozijifozigu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/45341849437.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/jubonupukufopeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=geography+terminology+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_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10932 bytes
SHA-256: f09885851cc8aca4f1f06361d6b6272ea55331f227c8c8c53475d190f7a0ca3f
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 17896 bytes
SHA-256: 829f28c97b8b3304851199349e5978fd9acd3d609ccd561d3deba71612e919b5
font_02_sfnt_off00013a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.