Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc50d205e2e2772…

MALICIOUS

PDF

86.0 KB Created: 2021-08-15 03:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16c8368c692e2c6fa7d3b8f613fed9a2 SHA-1: 4a0f140c519fae20bcccdfcd17f373da7a616aa4 SHA-256: dbc50d205e2e2772e775c31402593dfa373ab8a3ba7b4ae1b8fabd1ee6589df9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed to redirect users to malicious sites, potentially for phishing or SEO spam. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=%C3%B3xido+de+calcio+nombre+sistem%C3%A1tico PDF link annotation
    • http://smartvoicecom.com/userfiles/6923420636.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d072ec78d---3701590006.pdfIn PDF document text
    • https://digireg.com/upload/demog.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/56437940404.pdfIn PDF document text
    • https://seikico.net/img-tym/files/26646448614.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/monuneru.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/newuloporuvunijaju.pdfIn PDF document text
    • https://nada70.org/userfiles/file/sugulivigi.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/25009703899.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/30732421581.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bba294d50daf3a3cdff67c2fe35d504a/fetevel.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/292233114429.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/9579155811.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/pitudokux.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/24663886472.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/merokupi.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2vudr2q1u9ebifcf38mg61qml3/5492523293.pdfIn PDF document text
    • http://besteva.com/upload/files/dugowetajawisopobikaga.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/gopujazorexapibopimoza.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ca8d04dd---99187547051.pdfIn PDF document text
    • http://nature-revive.org/files/file/42577116334.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da328611d9---11859734332.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/66d68c7aaaa424f1d68d1ad668187817/63972733957.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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 20928 bytes
SHA-256: dc7a18252f41abdca6900fa508f40ba90e19c902fc83d9b2cb481606c5f8d769
font_01_sfnt_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 11000 bytes
SHA-256: 4104f59a00933b2726b667eac2f781cc43f52c81825f7a8fd711380fe40cf73f
font_02_sfnt_off00012ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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