Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b9aca4e0815aeb…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 03:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d281493dfa0d580d13fde4139bb449b SHA-1: 0c1a8c83440854b326b7f60b38d4fd3ef0fbaa64 SHA-256: d3b9aca4e0815aeb0c38daffcedbb7f73db1da0144bcdc3f1e8237289334af14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious payloads. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the intent is to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=global+competitiveness+report+2015-16+pdf PDF link annotation
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610616066237b---96479504127.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ab068523---rezipaworixavefawu.pdfIn PDF document text
    • http://schubert-hh.de/image/file/sasoxupureji.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b056836d7---tamidopatotupaliduxu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0v4ndpallc94f5b85er1nfnf35/favezu.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/60925998118.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/nabevovepamep.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/puletugubidexulokowez.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f0dec52b---jomekafejeronefojazefoj.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/dipamufisuzefax.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/84710924813.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210623105642.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7gjjar08jmvtuind5asdh091v7/wurujefebupojerera.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/clakptimhqulla49u40n6a5kt1/zulororuka.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/655fdad1dc874cb94fc5fb48e100be74/67380196742.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/masosobeg.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0092469212f838fa0621e62f49c03362/vuser.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b7dbd52bb88a7fc8cc2a8f4a1c5c2ccf/jomabon.pdfIn PDF document text
    • http://k1a.ru/images/files/file/gezajexoranunetogemu.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/kegatotegoj.pdfIn PDF document text
    • https://jobtiara.com/files/files/91451922697.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/92938988451.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/72741169732.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb703dfd2---guxobixogodiv.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/kupobawogagubawomozed.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_off0000bce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE7 17208 bytes
SHA-256: 4a4dba8ce24d8bd34099de3552f026c3eb505e58e582bc2a72a50e2261240d5f
font_01_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 11656 bytes
SHA-256: 0d7688da66db47cd07796bded7f46e9807c22a5306e0d588a805d5557dcb186d
font_02_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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