Malicious PDF — malware analysis report

Static analysis result for SHA-256 4576d1a8c266302f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 10:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 536e5527cc24f1cea45cbce41574fc41 SHA-1: ee2299d571685ba8e586af799673814e3fe7e1c0 SHA-256: 4576d1a8c266302f5e4e235b4253ff7988c742ca641906c719466510dd2f0ecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating it functions as a link farm to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing and trojan activity. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nomylo.ru/uplcv?utm_term=who+is+malala+yousafzai+pdf PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a3f7a543---68154041722.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/nejodekimamikolufapeva.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/worejes.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/kelotawobu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160903f14154a0---pitamegusazu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a72ad285---zufilasuvoju.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b81fb537e5c---tibaloxerakize.pdfIn PDF document text
    • http://zimmerei-possert.at/sufizifuxedazivudor.pdfIn PDF document text
    • http://pinxedien.net/upload/files/betixa.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/narivinajefawufafil.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/73249545573.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/vafijarukazam.pdfIn PDF document text
    • https://areicon.com/images/file/19678153604.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3402d983---kulifoxat.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8a60860a6e80a828e8f233fab468cfa8/jegupufeferufotaz.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c659d6d93e---41151980568.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/61736158477.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gnfst4gq3fve4v3cmr8t3smim4/74372505023.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8e00e06f---vikujesotinidij.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/8952399054.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/badonefoxozi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/74d44141fc9a184880b8cbb3cd64528b/xupafejixowu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/13273366855.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tqbei4g22go187hhu06dn73ka6/17664909459.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/45032071033.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_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 17780 bytes
SHA-256: d24db18b0523e84a379e74dadc86dd2947769c3bc48a65f643eb827329fdc2b8
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 10596 bytes
SHA-256: b6eca1dfcf2032b7814a499c71a6bbf69a860fd768c299f7afdb474fef42571e

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