Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b44d920450fa09…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 19:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2d8c43d2996d9b23b18d57d1ccb388b SHA-1: 231a7b2a3007572eff9738f9b407c9fb177ec0af SHA-256: 99b44d920450fa09b094b5755bdfff86d3ba819f8bdfbfc422a61fbbda57859a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://majubesar.info/contents/files/wuregovokuzamoz.pdf In PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/tireroditutakir.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/85410438187.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/banabulokeruxapegedaz.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/65994161794.pdfIn PDF document text
    • http://yjccnc.com/upload/files/zofozenagatu.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/wowelavuviboza.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/12453783720.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/88776631588.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/renalifuxusesumadevefa.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/wefigigudurikajeju.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/94758045461.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/togikudexemupigidomarixav.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/25827548475.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/rozogexedazobepuv.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9g3rm1dd2bln4dj0dd2p4ihpqi/sovomajimobamejexul.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/jibakoziwejoladuborabo.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/52356035127.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/wuxenukipaxofomitoli.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/regewu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8ae2576d---wofivatow.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/86846795277.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6addac54cf61f5d62b941a2975b66c55/judakawimoluziwotares.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/13061477533.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/32253675533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=laxmi+bomb+full+movie+downloadPDF 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_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 10600 bytes
SHA-256: 087982084336e8a7691e6d2b5921af8ffe3c627474f7da1bb87ea936be32e0d8
font_02_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 19416 bytes
SHA-256: 8bdc6370d263d4da7673b879f4cad0687a4017443760ee9a4efdd14bf7f2ed84