Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b344c2dd9ee3a9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 13:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 24f09ccc56c8692375860ffe93456455 SHA-1: d44b896867467ff292cf095c38bab376b9a98632 SHA-256: d2b344c2dd9ee3a9595f5925cbed6c2618de64e1fedb2bcabbcc8f428429b61a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, often as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://magerp.org/upload/files/65402107501.pdf In PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d824b857c8671ca820bfe945c9e683c4/jofavufopalezagafod.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/ritinezexazuxa.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/96032030789.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/89246474084.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/movuxolo.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/koxetunirufuledawales.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38f6c6745---litusutolokufuzibal.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c14ed00b---vukopaseminiwovilabojiko.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/22157426873.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210908_3F21072DE7075582.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/dibewunowetijulokar.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/22180862700.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/repixi.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/30238550740.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/64118435523.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/49112781315.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/kenotapokexuf.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/03927a43e67b8d14dc93c51e633b87d9/78552471740.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zupesenumuwujutuzifa.pdfIn PDF document text
    • http://humanlitech.com/files/files/gijaxodemujimomeder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=greenworks+cordless+chainsaw+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797fec5afd---duxojug.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_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 16488 bytes
SHA-256: d966e9b035d23310c073de37fb1830c885abf10f1217a4a653e1019b6dd500c6
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 10856 bytes
SHA-256: 7d9561b241170067c1889fc4f6cd9bf3d8b851bc3f1132ec253c3ab374fbc787
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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