Malicious PDF — malware analysis report

Static analysis result for SHA-256 4725c5f5f02aab57…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 01:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b9306f5df18deb9c3485bb22f9ca61e SHA-1: dae5066580c958bb59ca2c6efb3fb0dd9f88b18d SHA-256: 4725c5f5f02aab5782cdfd1f1cd7a47adaaa550ee57289640bc23ac0096f8efd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or redirecting to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to direct the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=merino+laminates+catalogue+pdf PDF link annotation
    • https://poganyvolgyi.hu/userfiles/file/jerekilegasipiw.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/31829913134.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/fikogubo.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/83631989015.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/93972987411.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/libulosi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9c7eb3f9---nazutijajivorogaxodusun.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qghgdd9d0t34us36o929a0k0n5/wutabudawavewonidopab.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/37496048271.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093daf34ff7b---95043010083.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/81456707905.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/zobadiwisix.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/menefaloxogijow.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/xupojesuwopu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/nofogediwo.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/79522784877.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/56022111572.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/43731084272.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210830_02E17CE00BD288A4.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/rrvtcvi2oaje4qahptvdmp0rpj/sidazetexesolovuxonigamu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613065b1b0da8---jejaxogusoru.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085bba7242b3---dovedunitupugawin.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/17146175735.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b34cbb2b0e3---bulezimu.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_off0000be47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE47 15552 bytes
SHA-256: cbdcb590e8d0c9fd9aed3a158da87b65e296c0ccb4f2cd86779799acfb19b029
font_01_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 11056 bytes
SHA-256: 5ae4de520892f1c8e0200fc4aaadfb0f03ddca34ca6d49a03bb9a4dfc27ae282
font_02_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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