Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bc51ca839de503…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 12:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 697a48016ebcfbb85e814f3ad1926caa SHA-1: ca8f34e2bc27e0da568d9b388bb121a8db39048d SHA-256: a6bc51ca839de50375cdd8c926122650ca53698b25abb4f9fb83e555d53a862d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ou1tu0fg9av53j44edu86bnb3n/xilupadakidikojupewegu.pdf In PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/wuzivezunozenalokutaf.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/48006869800.pdfIn PDF document text
    • http://www.celso.org/download/68666037848.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852d6542266---webaminazin.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/zinupuzuve.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d92b0be3e---dezigekuxakupabaxezasog.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/44797254286.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/wadikakarowoku.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/42593027146.pdfIn PDF document text
    • https://hoalavender.net/upload/files/pibumebivub.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/90mo5cug3d83nosus9r7ju89fq/94253334773.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/84199819785.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7b1333036a84a2fc6c2153482764d8d4/81350736329.pdfIn PDF document text
    • http://xycrusher.com/d/files/xanebejogogobi.pdfIn PDF document text
    • http://ippon.lv/uploads/File/rirasumiganuj.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc69fca562---52379498511.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f2262ca0d87b617b523b426b9c7b39bb/xujokedusaramajakafukom.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/kqni25kg89jntpgur93m7qg29t/xewuzu.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/56734263712.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vigajiboxo.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e8f28630623e90d0fafe2a229cdb7099/77260565100.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/76451041632.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160822c2d09009---nufofovokofolizujajeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ginger+zee+and+husbandPDF 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_off0000bfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBF 16884 bytes
SHA-256: 668526fb0e340c4798a02add435cee31ed63039c81ba87c6c48559aeafbf817f
font_01_sfnt_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 10600 bytes
SHA-256: a9559672795ff78c7bdad55bfd333be9cce7196c78d55e804de29676d2b6ff6d