Malicious PDF — malware analysis report

Static analysis result for SHA-256 919880c17019e2dc…

MALICIOUS

PDF

83.6 KB Created: 2021-08-09 22:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49325669c11d51121e443acf4a8f5c16 SHA-1: 0a21f2b2cc23a6a4aa4b64a8b81fe611089da1e3 SHA-256: 919880c17019e2dca1965ccda1ea3405d7211c7ec337317ef933207555e48962
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites hosted on compromised CMS platforms, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c44a27a2bf---wedigemobuwomamu.pdf In PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/romawojis.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/m833vci2b39hulu7o04g46k733/81975415144.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/39431581392.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/dinorusin.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/i7f1gb0sve9jcrj8gjuiu4enig/10624723147.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/96213042324.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/eplf45nuu70lp7scs8qo397ui4/towizoworawo.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/82ae140b3e5d2393901009225933dbea/51718037679.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/32295033673.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f55d0fbc2---puvixorob.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f613f08b043---64797312533.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/vesifaguzunotene.pdfIn PDF document text
    • https://termofriz.rs//files/xodafa.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/47291101740.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/11160263214.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/zupatakipatekudinobamob.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/bikovu.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/52356154891.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/rovorowowaperu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088194c98dd5---zatafego.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/jisigajetotojitirel.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692e6b9454---jagatidetonefatezuxiwi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e443fdd9---lelosixiwesujigomobes.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/telezaliroxadimijuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=flight+of+the+bumblebee+piano+sheet+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891c4a73183---zutoxididobukijozuk.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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 11060 bytes
SHA-256: fa234c92adb9195b35f9b0edb6af6c4f8bff73c566e892c00dd51fad8a00e543
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 17476 bytes
SHA-256: 63c68a90e7bb7b6eac54d2d54b4e20b4ecf5bb451ac4210433dd1f620e9be96c
font_02_sfnt_off000127d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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