Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7844cc3233668fe…

MALICIOUS

PDF

88.4 KB Created: 2021-08-26 10:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b2790e5c04b937d793cb68c4a2a5fc7 SHA-1: 7a90068a689105c3e5f43dcac16cf513042aeb92 SHA-256: f7844cc3233668fef243b333b53b1c9fd35af5c12b8777451d75948c2eb88377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting it's used for phishing or distributing further malware. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://electroagro.es/pub/files/9721652525.pdf In PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/juluni.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/togekegodumo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f92a1534c---89640777703.pdfIn PDF document text
    • https://dcimx.com/files/diretizupifatukojobo.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/kunofibisalodezenuti.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/77088598204.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852070c7838---wexuzoninoworav.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/675c3e3bfbc65dff3dc3c5767b46fb0f/24696458363.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/16866550330.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607144870022e---wexilisuzegiruxovix.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/irik0pt9luf6rohpeuq65osahk/52156650734.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac5c5eb1d---80718112154.pdfIn PDF document text
    • https://rippa.pt/files/file/92666800626.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67ea4cf4c5---xudefofikaw.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e790369b3f---sizonewavivafufavexa.pdfIn PDF document text
    • https://cityface.cz/res/file/fejun.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/78023786690.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/680496084.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/78clblfa0crfno2hgl21com516/43531920458.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/11186648644.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/98885081832.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/19127762151.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/pipaneze.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/29441288999.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8b798c5266d37d71d3624e97971b34c7/monuxopus.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/65712474595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lady+gaga+iconic+outfitsPDF 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_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 17248 bytes
SHA-256: dcc9e816eeac726eeb86457d476006b8b073d3cd4485c495b6432322ab7c91b0
font_01_sfnt_off000122dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 10544 bytes
SHA-256: 9a9b52685ecfc6907cf9bbd6252b55b93089e0e970057d439b07a78fdcfb9b49
font_02_sfnt_off00013ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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