Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df933a12ca7b254…

MALICIOUS

PDF

78.8 KB Created: 2021-09-10 04:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c3bdfc05b2e7b11493e0e680837aea1 SHA-1: d05f3f2d0a272fc22ecb52ab4505cb3cc04c7771 SHA-256: 6df933a12ca7b2544936ae83354d422a77ee2ad20a5b320a00e68d2df9227372
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, which is indicative of malicious activity. The heuristic firings suggest this PDF is designed as a phishing lure, potentially leading to the download of a secondary payload. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=government+online+learning+platform PDF link annotation
    • http://157.230.241.115/image/upload/File/xezapub.pdfPDF link annotation
    • http://erh-hu.com/userfiles/file/tujosebitekobotogata.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/49287573462.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/51273979683.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/74117889777.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/banekot.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/novezilajuvu.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/94551200788.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/dipovujugorasirawepar.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///nawedasinekowopevekigisuw.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/37373832968.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/23159326574.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kulb13n7r451bnaps3d9tmu9cc/gojasar.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/2719669101.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/sasipugetepu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4899da662---84628029558.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/50535000995.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/82352425465.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/65972341155.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rfm4q11k6nfnqb9g5ie6n94p2u/61724259620.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/vubuxijujupijozof.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161342afd41cfe---luvisuz.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/megubapetidepeme.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/gubagapalejonotu.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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 17032 bytes
SHA-256: 5ea064e06d89a2087d62745c7a60e689b291bc5bacdb671226f45b84dd87d736
font_01_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 10640 bytes
SHA-256: 65b935d7ed783e95e50cd0bbba9149c97efd56bc6ea85285dff5105e9a4dc963
font_02_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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