Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e26244bdad07a4…

MALICIOUS

PDF

138.4 KB Created: 2021-06-13 01:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c8b022a730bbf28c2ab787a46965f6b2 SHA-1: 534f8c87f32a30ca51812af9faab4d945625cef3 SHA-256: 56e26244bdad07a4d1ae22f3d1fa96aeeadc11b2d797aa0c0aa16faf2f3e4ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/uplcv?utm_term=longman+academic+writing+series+2+paragraphs+pdf PDF link annotation
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/37fc0571e680e75dd0a63f6dba4b3bd8/bazinamijoxufukaw.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b689b755300---57681006554.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8e331b4e7d9675225119cbfcef56c6b6/1617896357.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0778ecc4ad---giwokonabimowizukigorir.pdfIn PDF document text
    • https://x-software.cz/data/file/67078804397.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5900f5bb---fenakazegen.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fa4b831943cda2fbc5b04d483925ddad/seratinaso.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0475e0c28799dcad78f5c9a3aec8866f/26336852594.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/zusanaladumobumajeze.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/kepaturidisovejud.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/9950e9e6c9e93e884fd746f94d59026d/41145317314.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6glnme4o6r8mq2v2v2q5fm2587/xupiguzunadijow.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/gimupamojetisugagezok.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/54286761288.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/ximis.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160813ffc626d5---gexurude.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/kokumokofobogiwejupe.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d490ca706---gutoveluniforuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000194ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194EE 18116 bytes
SHA-256: f678003bd2b59de4a6db38fcad67201ee87da1300adefd717b1bedd0b9826ab5
font_01_sfnt_off0001cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFDE 5704 bytes
SHA-256: bc8c7777f3b9f5acbaf440f2c214dec3b444d191f351effcf7727b2241d97e82
font_02_sfnt_off0001e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E335 26652 bytes
SHA-256: c9ad9beee116c302ef6550d57623f30760595b9f446a27c74aafdfb2d082b6af