Malicious PDF — malware analysis report

Static analysis result for SHA-256 21644d09d30aeb78…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 03:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78a7b242a81bb402338c1771057fad45 SHA-1: aaf92a840d84958f2bca595dcb50d63e7850f6b6 SHA-256: 21644d09d30aeb780eee7eb9e39b98e6b0ece4aeab942c87ac9cfcd6eb2915d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=keystone+actuator+epi+2+manual PDF link annotation
    • http://jhdljz.com/userfiles/file/1625643010.pdfIn PDF document text
    • http://rld-carbon.ru/file/narazowisatuwezuwin.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/jikewugowife.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/tevenodasavitugodiji.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/60652728266.pdfIn PDF document text
    • http://cityfate.com/files/files/30928095973.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/54437428254.pdfIn PDF document text
    • http://normel.org/files/upload/file/lumawek.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/38195798731.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/55805401069.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608028655b45c---19199447996.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc26bca7f2b---35648543151.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/46639490367.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7481abd105c24801410456664c8340a3/69042036560.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6f2d26ed8c9861954361520da29cec22/kosab.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a63b4cdb1---11464290284.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/39567816433.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/monaxanosakular.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2d4871b8---62547633094.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dff81286bfce2bd700a00bac2519f1c6/wokoresijepinodewuref.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d273266fd0---kaduwitukelumubitizurik.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/136620541.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234eefd7659---fesimowosafadole.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/gejawebokozubafodawirokup.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dobijido.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/supaxi.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_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 16988 bytes
SHA-256: ccb3383c719a5e0e7aaa243abae8083a8a5547471217dc234b23ef0657671cef
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 10860 bytes
SHA-256: 377f703c7d8d942a678b44826b855b27648a17afd3370a68c6e4453d7d95f0d4
font_02_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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