Malicious PDF — malware analysis report

Static analysis result for SHA-256 1591d9dee63575ad…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 20:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7021fe4767443fc983f3312f21baf44 SHA-1: 10105b3a9a911ec1a606e321c1857eab4c9ef7ad SHA-256: 1591d9dee63575ad0ca01d9179380c329541f92b3413a04431b2658b0c940bdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=nordvpn+pro+apk+cracked PDF link annotation
    • http://rebornfair.com/FileData/ckfinder/files/20210901_2540800BA9E92B45.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4833332bbb7b9c28e185eef9f8624296/dinubovoxikov.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/lavuvikod.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb1159689---59225651302.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/bujade.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/37708002056.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/rasiwijusagavogom.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jotulati.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/33906748570.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/17640335051.pdfIn PDF document text
    • http://195exim.com/datas/files/dugixobeti.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/91034250689.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cff24a35c---fakozotubatalapefevole.pdfIn PDF document text
    • http://zerosquareonline.com/file/98452283122.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/19802384031.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/volapopidumaxanewevasaz.pdfIn PDF document text
    • http://wajl.net/img/file/2021914175927.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-09-18-57-01-69.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/jisuxoworiwanadip.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/xiketebixagafofugorodu.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/42728144567.pdfIn PDF document text
    • https://rosycaffe.com/file/26470887605.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/limiforexelanovukopojewep.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/25248406597.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/vabepuserazinixafexap.pdfIn PDF document text
    • 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_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 17992 bytes
SHA-256: f265bc60115aeb840ec4d1318f2811ee0ba594c819086cd514f9cd4ef69fef1b
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 10236 bytes
SHA-256: 5093dbc539872bef2e9645ef683bafc70f8fbfa381618b693aa9c276e25d75b5
font_02_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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