Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71cda7a07d83659…

MALICIOUS

PDF

90.9 KB Created: 2021-08-10 13:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15b1b479f723b39d7e1213ed57914f86 SHA-1: b7b3b750ef3d6e78cd0f4cbc006fd2987b62cb68 SHA-256: d71cda7a07d836590bffdeeba7879b8c32fd04bb4bd99cb1ffcd5ee0ee8bc53a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a business email compromise (BEC) or financial scam. The ML classifier and ClamAV detection further support its malicious nature, indicating it's designed to redirect users to malicious content, likely for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://wastran.ru/uplcv?utm_term=what+is+the+theme+of+the+lottery+ticket PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160df19fd68e33---95013440563.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/ninojetinuw.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/5010088619.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/perenemudumesilon.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/dowalagetebozofexabewef.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/73920179396.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c13d5e16f---9809050844.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb956e24680---43929516692.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/givimeboxixexigulala.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b56cef66f2d---suwepom.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/63790436451.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5rnd95k03sid6ki10hoej1jcv9/nepoxajozimo.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/aa4484566e45bf19243ca7674c8d8c0f/74123428117.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607458f776b89---35187962892.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/7fi2umlkhu4hmv1jfavjfbbm81/lepasegatek.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2539df726cf635e09339b22d61e3dc59/vitigezurokusilenine.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/lalewito.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/zamadalimo.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/23481421019.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/26094254.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/43581242602.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/34164411217.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/zesane.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/ledajuduzamosuxaxuxaxewar.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/mejojilonufililituwuva.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4db97a51d7---vuboti.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/9358255412.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34c95284b---ponisajaler.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_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 10696 bytes
SHA-256: 44c895ed41b8e8d7b6e842cea2d02f1621d78a4ed43eccbaac2c61a914c775bb
font_01_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 17344 bytes
SHA-256: bd72b6d55c563fed485e62e2b9199f25c64e2b8c0581d9b057aa7e5a7b9ad32f

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