Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebd927aafe7fb0a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 14:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76298cdd38a9207d1936f1baae0d6fb1 SHA-1: a11b366c436ec421f88ed0894a7e41e4acc4ca77 SHA-256: 9ebd927aafe7fb0a0f7ddc8e73580a5958ee6f0c8004eac5b8ed2237bdfd8a5d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=diarrhea+diet+pdf PDF link annotation
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6830412e---80102225384.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/62c041vv48q1fbh15eh351baec/besetugotonemeruwonokeze.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/wunokalivezuvogowusuk.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/59eba33254ab6268af8b80ca0390a7c7/fawuwozu.pdfIn PDF document text
    • http://aqcons.vn/upload/files/borofute.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/24728750608.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e152e62d2f264d4c9ac4187477ee7a62/ramoxe.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e47e4a83b144eae077fb5d8a3932790d/kejisutosoremuximosetu.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/borajonufimusimo.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202108161333356576.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/xazesezafoxopolosogewuk.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zedimaxipobaxuzizejop.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ctgoj53hca0bakrhdftmstg178/datufo.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/92223990756.pdfIn PDF document text
    • https://majubesar.com/contents//files/54395780980.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/gimikowunurivikawuru.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kufujimafapujemug.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/25271296446.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/bimafufojegavujulewoza.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6a42a2ad---23267535782.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/67906997316.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8a8d07d54---xiporupurikunizitepomi.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/vojufifazuta.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/dubelagala.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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 10160 bytes
SHA-256: 335524773b11c670f86c9d3d360df532792e80966be6888ff22b4c02beb19b09
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 17208 bytes
SHA-256: f09fbb7eac41984ceefde5e05a7b7ee2cef8a7bd86d90137878295cf8f5f683b
font_02_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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