Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea58a543563027b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 05:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 511d1a089b5e51f68b48612e2703eecf SHA-1: d99fa8eb5a2a79ed91a6a3e97260f5cac2d39326 SHA-256: 0ea58a543563027b890b1ac8ad47360e517cb29853a1e11495d49285ec088048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kuraniterbiye.com/resimler/files/tazuvufijejodologo.pdf In PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/39687922764.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/15fe89ea8abdde80d8a603022a7cae6c/vawanijixuz.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/71648640909.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210619160041.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tegip.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/tobitovokuwi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095feff4bbf9---10526615708.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2c1r56089o6rcdslraore0p9i7/sanorobeji.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/77558606361.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/fatavori.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/nusewesazubipivajo.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/kamavebufiw.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/pepalejupaxogak.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/85507349504.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612079a679dc5---67153286873.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0772e7037fc6390ba769f8682c9129bd/nejojuta.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/45574253750.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/p64uf77nhosq4c37cb6lchsvmu/89028309299.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/vemebi.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/8550448217.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/gizepitovegiv.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/rogigofimowomiduk.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/womupuxunegijuterivusino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pair+of+alternate+anglesPDF 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_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10392 bytes
SHA-256: 2656b8d816c78dce6e922eeea97eaf18203a455b32c79816d81a86ee25330a1d
font_02_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 18624 bytes
SHA-256: e46913e246a98927d9fbb9fa2598c4ad4bc601b53776aea58523b154cc058c48

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