Malicious PDF — malware analysis report

Static analysis result for SHA-256 24beec329b54d923…

MALICIOUS

PDF

84.4 KB Created: 2021-08-07 22:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1f5ae910363996c962c20d28b755750 SHA-1: 964e4038162b308639324cb6c7347424b8a17dc7 SHA-256: 24beec329b54d923b94cc186c40614220fd9677eb8ac39f6e0103725c6c1331c
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 ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves malicious content. The heuristics indicate it functions as a link farm, pointing to numerous domains, some of which are hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to potentially harmful websites, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://turhantur.com/turhantur/files/36858280427.pdf In PDF document text
    • http://accronline.com/userfiles/file/46405779680.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/vasojitonomosexupigefu.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/834064300.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca43c6f5b8---53749024711.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae35e29ed---zanelo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/70011473569.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/25224767975.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/webawogakixovigixogod.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/xewupuvepemipur.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57d2c9fa4---32563555766.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/wipevologi.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/38736718125.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/36198459228.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/97353281032.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740fa6a307b---venexude.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d691f10a2---wogova.pdfIn PDF document text
    • http://2440027.ru/upload/file/63143821170.pdfIn PDF document text
    • https://aspirans.com/files/file/36206617937.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/69165037743.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baade1e0324---6186744538.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/et76292lr00lv6bv8g6tt7lujd/49827121517.pdfIn PDF document text
    • https://norservis.com/files/files/pujodedisigape.pdfIn PDF document text
    • http://medica-brno.com/files/gunewajalubuwanas.pdfIn PDF document text
    • http://jp-cable.com/d/files/gujelumilazazodudijori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ejemplo+de+ensayo+argumentativo+cientificoPDF 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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 11356 bytes
SHA-256: 094d6dcb667d76461f50fc14694570f447a767c2d6806ca8f82fdc895bb08461
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 17264 bytes
SHA-256: 4f7d6d467b84269c2626761491efb3f4eed0efc785b9d7f834359db593dd2f53
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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