Malicious PDF — malware analysis report

Static analysis result for SHA-256 471df326a441e2c0…

MALICIOUS

PDF

88.0 KB Created: 2021-07-10 13:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 785afc699233007f97d085cdec7ad9ba SHA-1: 7f9359425c6c96cd9bec780488f2f62755f434f5 SHA-256: 471df326a441e2c0b562084d42165c61c80a7e254c1a95bc2d98e08af83336e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=the+big+bake+off PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/46c16c588bfb3d80f2cae3f6f9d00af1/xunobivorazolezorawikew.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/likifitukukasixakedi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/648q4cr9uo63djd4cu80oa5013/kojemixogo.pdfIn PDF document text
    • http://lawngo.net/fckfiles/61060892300.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t2e2lp3ref81s1615sp7cej640/tazafekosijixalivepe.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140ff35db9---ziluxokiselegirazubo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/187od8ilrdau20quoktgmrv7qk/jisataxalemezima.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609265113de16---82749027146.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30fc7ab92c---41691273092.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/gopatifomog.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9e0c3a63---43717721044.pdfIn PDF document text
    • https://2acontractor.it/images/file/duwoxinazafo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078179fa56ec---tebibelivebezowafigon.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/fufevojibazabumifokenodul.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/92292472209.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/49095792313.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe0cbd2eff---4340616834.pdfIn PDF document text
    • https://csn-alliance.com/data/files/42416856037.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/34329215414.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ecbe3ed8ab6b2df355aba6df0ca4d7f7/wimije.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/womepegejikokiv.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/1143857138.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_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 16812 bytes
SHA-256: fcb2fb4521e27ac2d7aef609b1cf84106b5fa8a06d245496108a56ab8b80f181
font_01_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1C 10172 bytes
SHA-256: a451957ee697890909e2abcc7df23cba8d0d6606b3c2fcdcb59b0394a3e3d52b

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