Malicious PDF — malware analysis report

Static analysis result for SHA-256 086b463109aac111…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 21:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42414d394967c81a708aca5d1f7d89ef SHA-1: 13fd401b3e16c3e1176e4a3bf9f5ff7a9c7426d2 SHA-256: 086b463109aac11147d67e82fb6d669d05af50da7273beaa7aefe3cfe455382a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits characteristics of a phishing lure, including a small file size and an image-based appearance designed to hide clickable links. Numerous URLs were extracted, many pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dac894d3ac5170173a7ca0c0b10d57d8/zonun.pdf In PDF document text
    • https://shioturboapi4-xyz.com/contents/files/wekizapagova.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/16314720129.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/56023647668.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/xuvipojevibimox.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/60051230774.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/vilinusidipofu.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/bagigugikemefupuw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162fc83523---11534566580.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/fixikaga.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/vitepegewesekile.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/latuziviwusepuratipama.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raludalumujujotame.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/86250385959.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/14007117788.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/degakogav.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/2351633956.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/49268516505.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f57b32db7---6097008312.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161317f1dc261a---13221235683.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/zozumojupujekizokisopi.pdfIn PDF document text
    • http://ifap.it/images/file/fegapagezedivodip.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/84262334288.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/tefida.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tenexu.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/9414911662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=app+que+identifica+musica+androidPDF 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_off0000b1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B8 14256 bytes
SHA-256: 1a05f9e902954c8c47725bcb4d607682a5b20774fd7c7050c85f6988e027ff60
font_01_sfnt_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 10964 bytes
SHA-256: 6d596b04fdc1e85a9f8129a9be7c125fbbd80c2d109931c34195fd4ede1f0605
font_02_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1