Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd3165e5bb36e61…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 08:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa6c283b24d6e29d37e06e9356c0e0a6 SHA-1: d00923937ba703c22ffb42b2d769979df6282e60 SHA-256: 1cd3165e5bb36e612391aac7232b32ff02456cc6390263ea93496861c1a00911
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=nck+dongle+crack+download PDF link annotation
    • http://tubemakingmachine.com/uploadfile/files/vuwax.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210915222146.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/66667001043.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/robitalijit.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/ronow.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/tibijipe.pdfIn PDF document text
    • http://it-hair.com/userfiles/76053016846.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613761a344519---6488603478.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/tedujebaneludugano.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/mekubebatixivel.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b7366bbef3cd0590cef9ba40ef751b3c/53845613468.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db2f5a2a9---togiruxibinavarujid.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/50a37fa5369f6bb89a5d855b33006886/53988339248.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/powusojuzejiwupedukuko.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210914_141558.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/25258690704.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/74521850656.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/90554924789.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/68463121343.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11937108447.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/suxusuzubinodis.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/20873560889.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/69073311408.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_off0000cab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB0 18476 bytes
SHA-256: 04d7e1d4f7a2ef10c822b2764f16d6278ef0c710f8e0cd9d7d7abba9308a508b
font_01_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 10344 bytes
SHA-256: 0c4338054334fec38b935d8dc00ba290f2e479de4c74fd4ab9d58e36dfc94e37

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