Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d85fac2947fd2ed…

MALICIOUS

PDF

114.6 KB Created: 2021-09-05 11:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6efb76d0ec59b9de88ca2808f2d0458 SHA-1: 74dc796651e9d0beff41bb4d538cf15bf44b96e8 SHA-256: 7d85fac2947fd2ed82f02ae189be81320eb2fb54224af1e0d1369fa7e6e7910d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/98d0895dc81f7819f8cc6a1e228f7394/42160735736.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dvp4t89ouu5ufvpm8bo4ktouj/kipogazagosipug.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/05f6e70fc92038c6b676fa8ba66cfc22/detoz.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/30460614614.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jokekovamepixemurol.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/83126207014.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d21dc827a00a930ef1b6a060265ee472/buzoxipodelafogudilikepoz.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88abb2f62---60884714247.pdfIn PDF document text
    • https://seikico.net/img-tym/files/moxulixopevaba.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/77911981357.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/kiwizegevapam.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160825969dbeb2---dikana.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/92372392060.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/telaziwakelefuvepu.pdfIn PDF document text
    • http://cl-pub.com/files/files/kowudukixat.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/26547827868.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/porodutid.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/93479579384.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/p6seumpnvbgvh2ihd5vd96e7j3/fanajixo.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/64123146642.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/26655159386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=indicadores+de+gestion+hospitalaria+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_off0001574f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574F 20456 bytes
SHA-256: 3e8c5aa331766d488428228261e3ad785548c2586a5ec09f5854e154372732c3
font_01_sfnt_off00018b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B8E 10852 bytes
SHA-256: 5db80d46926af8c8db90c88329d3786fe114d2195293068a019f4423580e47c8
font_02_sfnt_off0001a450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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