Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd731a2537553c7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 14:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a89fbe47fbec23dfa95e1ab26b83d7f SHA-1: c1764a511ea15985c00e1339b9dcedfe187eaa94 SHA-256: 5cd731a2537553c7ad8badac3f45d20ff57dfac402d094699011bed25f45c974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0c6fea82e7936de1d8ed3be9658fb7e7/dabiruvuxis.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3dn7cbvgj4sec8gpb0q36ga0mn/17586559656.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wetoriwin.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/78941544644.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/xilovuzukigizanipinosafe.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/25155276710.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffd90cf15---lawadudenusap.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/25044051565.pdfIn PDF document text
    • https://medius.sk/userfiles/file/wuvibekedexarupikaga.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210830033153.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/tumeledu.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/jazinapuxul.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612acda53efa5---82940028668.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/8203565364.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2254323f21---sigetatorozaxetedokobamax.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2393a1c5---85372691455.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a36cf5817b2---kabanifaxexif.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/94543355590.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/4af8f14f685f09d337c543710e38ebf8/gonesimalozepetaxo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc56b6d9e---nolomebidupajezubol.pdfIn PDF document text
    • http://yilip.net/userData/board/file/zubex.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/69440539411.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/xilifopagixapasojuwip.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/juwad.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rjmohavjm3nejsnu8ja7ploua1/30966782878.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/24827737846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=groupe+sonelgaz+pdfPDF link annotation
    • 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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 10684 bytes
SHA-256: 6850ff035497a56373d1b0dab6e4aa416e56407b3bda8d27147639f7b242957a
font_02_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 19884 bytes
SHA-256: 6c36860dbe2a5a2b1c91afe75d5f62f4ed241f69e98d848536a715ef1c5b9788

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