Malicious PDF — malware analysis report

Static analysis result for SHA-256 79181eaf899ed256…

MALICIOUS

PDF

87.6 KB Created: 2021-08-06 23:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96a30832ea3343390f92cb933bfc7a8a SHA-1: 4032cc8ee5fa23a5a3e62d8be1471d6394a45356 SHA-256: 79181eaf899ed25666cd57a84b4fbe4323396f4b4e3914e28ebaf162dac66ece
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pixomot.ru/uplcv?utm_term=js63c+parts+diagram PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a923463f6ad---99284344328.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106081841.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/zipobemeke.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/famosaluxenamibiwerob.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d279dd062d---34299215624.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ba5de2ed9---64364644865.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/513e0c7f1e3b81f806ab1327e291a06d/dijilitotom.pdfIn PDF document text
    • http://effektfilm.de/files/file/wanatarovuvepivigevawaxav.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/70158859254.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/28880705423.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/38463497902.pdfIn PDF document text
    • https://plasy.com/uploads/file/28487921626.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b16705094b8---sexufiwirigudejenidapezom.pdfIn PDF document text
    • http://kunbot.com/upload/files/17836884852.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/xalarewadasopejawit.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/rubejotekad.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2203a6de4e---45453387873.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3d513162---38584478728.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2f9e2672---wawijis.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ubkdtvrnmtg2acsfmb2nckoad3/90426093983.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-07-25/2107252212560973157g6gv2m6ltwh.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/57017537907.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4jfosf2n5bituu6r4sqefk342u/bozowazodejugokarugumi.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/12352024399.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_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 10784 bytes
SHA-256: 32a4684a850e36478a88b018695d19e1cd6ccdb61a3da7a2f26443dc8417398c
font_01_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 16744 bytes
SHA-256: 47b4a7f9a3c2e7fd49812ef81f1dc0661c0f25f5f2285e79a953ca959020c399
font_02_sfnt_off00013804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1