Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84de65f7008219b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 23:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82e4e211a3c4939da2155dd0693de8bc SHA-1: fedd16cd626ac894ebbdca8dccc45cc59d81c678 SHA-256: d84de65f7008219b6de50df3019e68c81fff8302a56e70cfea70a2050d1a57dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://ordinate-ltd.com/file_media/file_image/file/17247513054.pdf In PDF document text
    • http://intertribo.sk/files/jakifuvemezaridijuvidagup.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/91739558352.pdfIn PDF document text
    • https://pepsima.biz/files/file/42538621800.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/logeje.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109040006494181.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2d2f8624178edae092736b5e5b17f0d8/momagozerorofujuvikef.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/tixuduzufure.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4adc401af---nabiremeziludabuxonunop.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/67488586127.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/82128084480.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s3osll3inrmg8s3i3v3cr8nfj2/nonijujoxebiraruwo.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/93202498606.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/65498934710.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/losagazupuwi.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/miwakasigazot.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kodijumovutexozoxujiwomu.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/1768318672.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/galubuwes.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/430101152.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexixowuninepam.pdfIn PDF document text
    • https://hinaweb.com/upload/file/90879711171.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/15485786577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=my+phone+does+not+install+appsPDF 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_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 17720 bytes
SHA-256: 95800b57655690522667d421d5a6f01ac3db32e8bf8949ac3b5f700b2a40820b
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 10496 bytes
SHA-256: b52000e7a9ceef2d85e10fcc09d34ceb266d29ff0bc17b918070a2796476660b
font_02_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1