Malicious PDF — malware analysis report

Static analysis result for SHA-256 79669bb4cc1e1b4a…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 08:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6286e3fe785d3d0cc47d99c5c1611e3 SHA-1: 4f526cb504590d7f3a63006f8164c19f2cfdcca4 SHA-256: 79669bb4cc1e1b4ab9d7e46e006b7b388034594cbe96f31e066dcccbc75cc83e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=kingsborough+early+college PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b936d8e6---rowilu.pdfIn PDF document text
    • http://remobudostol.pl/pliki/28935293040.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb7f1c326---56583691690.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/s26fe7nl72d50srtuplsjlujs8/waxekofosovugejuresamemuw.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9ad32aa8bf9c86a228ceeea056dff4c6/zogenunerorujudedefa.pdfIn PDF document text
    • http://atek-ent.com/upload/file/potadumome.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3d59eabc6b0eb8acd0e3b363289da612/limazalexexekunez.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/31537989320.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8soqtqdo7d6dpfkoert20hkj06/kezib.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609635b4a93f4---31324041973.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/54302297562.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/32315851100.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/64378223002.pdfIn PDF document text
    • https://cargobull.cz/res/file/zixiwidalaxagej.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc1a87f527---newizekebijod.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8cd43f749bada775c7c146f842ba494e/60983920565.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee31289d0---resajejexa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t9eub25but2a8g85fgur6n8cb3/87746513677.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e52b614f5---xatit.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82aec3ca51---lakigewupavepusiratuguk.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9b394370---zuvitu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6630935d8---xomujo.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1622366653538.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/chtmkagh9fihreifr230p36hd9/loxosikuvilufitiw.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_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 16872 bytes
SHA-256: 7ff2888686bb5a6a9b161eec805164668cca126c90d724d9815e50f4244c09be
font_02_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 10756 bytes
SHA-256: 9d804498d47989f355e59f290c8311588f9611501120dc73c98c3b59ff5f9529

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