Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b61058e9fb848ad…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 22:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96551180248236e19509b3299e74ca83 SHA-1: 41bf0021cf3e529cccc9a4ca414e19aab7b92832 SHA-256: 5b61058e9fb848ade54df68d42bdd6b878ba72a9d756ff88e911af3a23fc7c79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Several heuristics indicate the PDF is part of a link farm pointing to compromised websites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://teresachild.com/upload/files/62252359585.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c9iltndqijrie28gsvkud0fja3/zigegisumijudosuzibelag.pdfIn PDF document text
    • https://rjpexport.com/files/sebusotizek.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/27031765324.pdfIn PDF document text
    • https://fasleh.net/Files/files/47136032237.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/43522884704.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/98414664693.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/bumokoziwuzuvipase.pdfIn PDF document text
    • https://lorus.rs/files/sowen.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/wapajegebapijop.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/tadel.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/jelewe.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/zaxasezatamotagidirogiv.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/fabotefejiloresawinovuse.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02acbf64f---neziguxukavazajemananisap.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/mojewi.pdfIn PDF document text
    • https://salonrewards.ca/images/file/galaxuniladimawofujazudoj.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/wekel.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/18395956240.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/10946677970.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354c75d516---14411007887.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/sozefalitosixesug.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/mefabufal.pdfIn PDF document text
    • http://aquatherm-graz.at/files/fetotuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=black+ops+2+zombies+cheats+xbox+360+townPDF 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_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 11656 bytes
SHA-256: 46d1b810bd5767052e7780992e35bfd9b6e3a4abaa9d229aed05c9331a831e98
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 18924 bytes
SHA-256: 08e2a212eb39da558b1f384b518c0b2d404fd01837c48aa331140796ef2b11ae
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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