Malicious PDF — malware analysis report

Static analysis result for SHA-256 4800452f20a3760a…

MALICIOUS

PDF

91.9 KB Created: 2021-09-03 00:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b52ddd48bbba4b9f3fc8839a9c8a358 SHA-1: 7e7ac98f11971abccf4b4979eac32fb1fc26e23b SHA-256: 4800452f20a3760a224840ff756f0e3a1ba4d2fcf47efb9dd5018b7dea3c851d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and URL patterns are consistent with a campaign that uses compromised websites to host and distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/1aqtbgepmi3500f2i09qgoeq57/luteluluzejerapiw.pdf In PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7d116f1288c7c01d167d5f1a38e01a60/beweje.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/15856746511.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8adrtgdl0138qsnacq6st33g9n/65438986449.pdfIn PDF document text
    • http://atek-ent.com/upload/file/83424836455.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab696e205ce---lixebovusur.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a0398ae3---bitugalafabutoxus.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/wazufoguvetip.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nrjrf9iofofb1uj57s96rb8jg7/48745690007.pdfIn PDF document text
    • http://mesterek.net/tmp/wufoxulebiguxubuzodatowa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/eb1d619f31b18e4be7d7067011952078/43191371260.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/s583t3piqni90pbsmr6r5c4rtk/livudedutotexolawoni.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zowanixuxidogoli.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/tedugoro.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/92abefd041434b207135573655bcb9f2/setimupolikugek.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/fgktbasf8808qk3o2u50stdhct/21166934792.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b37fd7cede3---pusepowakubupepewededoju.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/wavomosomakamefol.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/50749109040.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/26660719453.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fh1n09pg6saj8ecug1vl19cp16/zifivelexabogum.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/wunatasuvoxudap.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/75193749270.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/30513942407.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103149729d11---naridegerelixojasekigulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=echometer+touch+manualPDF 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_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10320 bytes
SHA-256: 1a07353f997d7490f5929d84f79cec00d01c54f6ed6d6cfb780fdccc2c66b5d7
font_01_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 17760 bytes
SHA-256: 78e67028febdf1bcd6a8fba4ba9d09df8ab8885f00c96c2ddfa297a196e993e9