Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c91b23c422f94e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 02:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 132764265cc7ca86a451847039d8182a SHA-1: e416ff92bb01512b29aaf675d1427034231b8e50 SHA-256: a4c91b23c422f94efd5315a13af46f18203eb4a0a3ca51ccd6f0d8357221d116
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and numerous external links align with techniques used to lure victims into clicking on malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=2011+jeep+wrangler+service+manual+pdf PDF link annotation
    • http://goldenmallbiotech.com/upload/files/4078175011.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/68692801474.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c954877a2ae1f4c1e78c3fa12f8fc809/72188512122.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/patifabo.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/dafutuw.pdfIn PDF document text
    • http://planetamama.ru/files/file/zojoze.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9f3a9f26094d3e259aa9dfed1ef235b2/gosojapegukumaju.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/wepokopuxikar.pdfIn PDF document text
    • https://mauspro.net/upload/files/fizoz.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e7f4e58c---ruwiluxi.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/81089897936.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/efdc6c832c3352ee1700477017069495/36137247461.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/wafonelotuwisofupage.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210726190854.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/45196143162.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/nepokotuwevaroxidumibemo.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/nokedafizavomami.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be7a4295221---durejodokexagadiwo.pdfIn PDF document text
    • https://egca.fr/userfiles/file/55916174448.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/51072989699.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/iorvm77kb25f1d9mk54573ge8j/xixadolubosawokumimimixa.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///2450078708.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3823e9423b---61902981474.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16074575486175---43193616516.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5021d8be7b---69647509041.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_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 11324 bytes
SHA-256: 8dcd85ab7ab3f5f95bfc8d61f57c9cc968c4f959b032cfe7c32d1e5d13aa6072
font_02_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 17960 bytes
SHA-256: d1bca15267c7fe2ee5933b0afa14dd7ecbddb61c9e10e4dea42565270bcbe87b

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