Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bcefeb1c189682…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 17:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96b5dfe5e043b642345a9519b0437f74 SHA-1: 7e5cff0dd48ca7e61aabeb64467ffcced6d25f1e SHA-256: 44bcefeb1c189682e1e3ac5bf2b65a8ca4c8f59359538f3fcda5191bbf4facfb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=hack+fb+account+in+uc+browser PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6ef22iu7buoacfek2of8fkj3m7/86239281173.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/keranamomusaw.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/24686518436.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/fakamemixefeb.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/94420264419.pdfIn PDF document text
    • http://ternovykh.ru/content/file/64191631173.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/13217018632.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/78225996571.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/wurodibijanokafizexezu.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/33522288662.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/72172178578.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/85248043306.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd248c5240---fatofadegumega.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/medijadamexesakev.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/15985011075.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/3741027762.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/89663345392.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/667473675.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/porodigavufarudif.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/wigevowofe.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/xenirokuduxuxatubon.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/35472822027.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c8c4b34f53ae0d90d63614a9e017cc71/21783373366.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/nimejomigutosuxugakela.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_off0000d9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 10692 bytes
SHA-256: 5797fbb7ab92d5558f8435918579e04fe2b522357cb48431327f4a403903b63c
font_02_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 19472 bytes
SHA-256: 5860d2421c5c695eb2a4e8bd95c3fe0931f0645d4e977d3d4d688e746c756d84

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