Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca94ba9eae60f26…

MALICIOUS

PDF

89.6 KB Created: 2021-10-06 06:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b568f93719f3ba7970048a948b04f60 SHA-1: 6239b1b7fac1be7267d4a0cb1b14f9426ced1a58 SHA-256: dca94ba9eae60f261a1d61da7764ad12233508dab6ea7d90232cc297018dcf13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with many URLs pointing to potentially compromised websites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates links to compromised WordPress upload storage, suggesting a malicious intent to host or distribute further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://amphorabeautyclub.com/campannas/file/fiwaw.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d960b7d58---sofumerovibadisebif.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/42142133492.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/jafezarenuwuvetodaj.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/13657471283.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20211003_031052.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/761695572.pdfIn PDF document text
    • http://stisk.com/file/vuvopewufexib.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/wotevebujid.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/vitibenuzu.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ramiwelomiribo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ejkkhbh1ndgo78hqhlj087e5es/18277973477.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/rusut.pdfIn PDF document text
    • https://wasael.com/userfiles/file/duborakizupuzererezug.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/554a620416315a035f80cdae1d3d2e1f/defiror.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/73115804241.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/jopebobojuvimive.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/79928078876.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/wubafusatituveguvime.pdfIn PDF document text
    • https://quizai.com/uploads/files/jutexulinipomezukiv.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210927_092221_7047.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615be8c17f510---mizosevexaz.pdfIn PDF document text
    • http://birdwatching.sk/media/file/47463156572.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16159b139ee3f1---rodifivotenef.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/87209508622.pdfIn PDF document text
    • https://mattress-leader.com/media/lizovefidibexilepixiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cell+transport+review+answer+keyPDF 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_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 18512 bytes
SHA-256: 19774769fdb0da305cedb2b3d0cae8833f1c8ce3377f01ed3a02639774f3abfa
font_01_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 10632 bytes
SHA-256: 2bc6d6275b54e27e06067897e07d53331acd0be94636c4323cbb1b5c197797aa
font_02_sfnt_off00014068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1