Malicious PDF — malware analysis report

Static analysis result for SHA-256 5763ef8e34ebf24f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 00:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7d739c5efae424da95c8d8d57fbcce0 SHA-1: 0fb7a738372e4c2b1327d503ef9c5327276c3698 SHA-256: 5763ef8e34ebf24f395c741b1cd79172bf75e44e1b9a9009f34bff9e43306215
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f6224d56---femut.pdf In PDF document text
    • https://autohausnschmidt.de/userfiles/file/58523186846.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/92590977575.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/jikowoliretotupawupip.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/zuperakijetofigagufi.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/88247075106.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5676a37adf---12472667494.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7aa5666e778a787c418ca91a8652cb4f/34652216451.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2e146159ea301de747121b295ead1151/xewejegotexovegaja.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/gofetexi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00a52574c5---11681793064.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/bekoxumase.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5c431a2f110531420c9ae20c89bae72d/dexiz.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/gafasuvegisaxudakizumo.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/sagalis.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/51vvjq0o7v08l13ua0q0o4mmmv/8527058521.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/23954683463.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/geforejilufa.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/72672848976.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4b926411ed1be72ff8f1d0841f0a1306/zuzefakejeror.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/notarowisufona.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/a1f068fc6a02e17c4e5ea5878e4a5a37/kimerepupole.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/0d0a05d20a8ff1507c8c7fa61d62cfd1/36257631882.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/bulazosakixarekavuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+lonely+hacker+mod+apk+free+downloadPDF 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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 18384 bytes
SHA-256: 4898f80f27e9d441ebc0f36f805f7be95466dcde3def784d2096ace150ec8baa
font_01_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 10784 bytes
SHA-256: d8651fecdc84eee136881c576aa776a6aea760a7a2d8faca317caffaa1f934a6

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