Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4c37ca08a598a7…

MALICIOUS

PDF

80.6 KB Created: 2021-06-27 14:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79259811dcc4232970961dc95a0bbb06 SHA-1: 3367d6ffa9daabe97578100227f1241317b035d3 SHA-256: 4b4c37ca08a598a7dab76d27da2312b6e21911fbac749f6046bf282443fa92f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=best+cute+baby+picture PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb60e8dc73---sidojuv.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098435284d3b---puxixojosod.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/jonanujames.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/85955354791.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57283ae6fe---dixawajigotuvijazarex.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb658ab71---xidalamabegexaluki.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ec3bs10gn55fiqpvgg7c6f6u80/tolodaboperav.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b009d65e---wajulasivototu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4dbe597fd---jisurisinosofajupiw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040515207686.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076499b11b37---56815837321.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/78680011740.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/pde29v8c10mdke77orqo6o7sig/fuxujisexomubik.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/80e334ad06328a52a0739739bea6a47f/zojesa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7a8avtq6ea3b5v1kq8bep3v29a/setewowajuvej.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982fa75b602---89633852488.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6752cfa3f---29982573136.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c02514d0d68---tawavojaxurude.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075eeb698a32---31435758322.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/393335fdd0a652801f7251c8c3c9ed93/48661496955.pdfIn PDF document text
    • http://limoride.net/gallery/file/pimotawozedojefekov.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/noneje.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/befamigebejataw.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 16524 bytes
SHA-256: 6e9c45e9a87991af6a2d74078b726f35e7b54b1559b5df88f289d2a05c6e9ddc
font_01_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10504 bytes
SHA-256: 696fa3727ac38188e230d40976ef27498f177971671e4f3258c4a9f74c120682
font_02_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1