Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a549d5665d9e75…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 08:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e085279eea26c23df32ec1d7759c10de SHA-1: 8cea7e7dd44a31a3987d94339e717c0d2151dec1 SHA-256: 81a549d5665d9e7524dcc224ec535f925da616abc193e93f35b48936088eda33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress uploads, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign, likely using embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=sensitive+touch+apk PDF link annotation
    • http://superfishinglewood.com/uploads/files/71618461242.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/10405683884.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb88413c7---nikajevulajetasero.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/10557216264.pdfIn PDF document text
    • https://rippa.pt/files/file/buvokoxizopirixenobutetu.pdfIn PDF document text
    • https://wildnaturetravel.com/File/31548443137.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/84922185600.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/83564190553.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/8153981093.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/zusisorofawapedemabo.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/difewupuwam.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/90820934299.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/85605823248.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/jexojodosif.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/rejed.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161491d5ea5084---govumezutemi.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/40850413857.pdfIn PDF document text
    • http://tradotel-riviera.com/file/99812646164.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/94673544813.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/62056afc3e2ed1dda58894236b919720/geridun.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_off0000b0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EC 17020 bytes
SHA-256: d4e7640cf07441a012866720330e60fa59ebc7870342d75c58b264bd47ae4093
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 10660 bytes
SHA-256: e4f77d1147cc66449410fe63e67acf44cb67d23ba9d882d378c190fcaac236a7