Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72e5ee0033ed259…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 09:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0c1e4b98a76aa0efc779860f3339cee SHA-1: 0452af32aabd33078877145d1f2f1377050cd890 SHA-256: b72e5ee0033ed25976ade2e135dde8ae65709eec007b4adb6015220856e06ddb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://agilesolutions.in/uploads/bigikexupuvubanaxenofe.pdf In PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/19173888596.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/vomibunixiwepije.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16148471bd7d60---rerajikefav.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f0c725e99356bd15d4f2b9b7b7ad2015/96745999847.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140c697b284c---mojewuledubalomoja.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/zadipebi.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/vuxifuvumakok.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/55739707217.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/21311629828.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/bupofulivarodufudi.pdfIn PDF document text
    • https://yifff.se/userfiles/file/pinepewidav.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/miledenunodirinaferixenam.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/nowidiseputepabok.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/29179203442.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/bimapobijodiniwomuwe.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dbcf5416b11ea0cb7a00c9ddc8e40568/lutewovuzajodegad.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/12845258164.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/79536433171.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/62816532995.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/71534149793.pdfIn PDF document text
    • https://aayams.com/userfiles/file/21366024261.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/funozopivugixorexabuves.pdfIn PDF document text
    • http://ore-processing.ru/d/files/62542757009.pdfIn PDF document text
    • https://bselink.com/userfiles/file/80382187061.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/dotedawizinamexewek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+full+version+android+apkPDF 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_off0000ba86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA86 15816 bytes
SHA-256: b52f3dfe251bdbdaed8912f986b0c5e216880d0711040f7156623851bc0a4fe4
font_01_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 10864 bytes
SHA-256: 6b980dbff39577c083652a4ecfe1ebb4c82a171ff962d95f2957095d1c41698f
font_02_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1