Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66a4722754a960b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 10:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22b3834db4d70a4ed96ebc2be25b8ce1 SHA-1: a25d45846f80cff451093005f9bba6c035d987c9 SHA-256: c66a4722754a960b5fc585844125fd631f5c800b1bae3159334fc49b96a2593f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=it+chapter+2+full+movie+apk+download PDF link annotation
    • http://retroldn.com/userfiles/file/96987192444.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161380be599583---mobegikelakiwijavisiza.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/bugujikukimajesetarileto.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/wimawit.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/59a28a0b645613b35be8f6b1b7ba9761/7288342603.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/fufadudopox.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4809c2ef7a8c8f928899bbcd9bc58ed7/6116789913.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/liluda.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/40189345918.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/21076300435.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/xonemifejezatikiwuzitila.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/70830247340.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/tojadelelukerutilokiki.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/selokawow.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/26830990997.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/57743643735.pdfIn PDF document text
    • https://bak.vn/upload/files/21588535481.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/lovizam.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309e4300c75---22725164268.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb6fb21cfc---rabotukobosiset.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/dizamopovarube.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/mawozerewo.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/49387807000.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/61233304221.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_off0000afe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE6 15048 bytes
SHA-256: 94980e381452d43677e2a48961798da26ba1eb8e8c4e54ff4bfdd7f5d9118c3b
font_01_sfnt_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 11132 bytes
SHA-256: 77c5de807594fdfac7579e628d34de4f2da2e14cebe790621a030e798709a811
font_02_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1