Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b634cceb794e0b5…

MALICIOUS

PDF

232.6 KB Created: 2021-07-27 21:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6b7a0f65cadc50aebf402c44b7ea3479 SHA-1: f2eb021c7475892021caadd545d99bdbfd9227a9 SHA-256: 9b634cceb794e0b53a30006270676ec54062b36f908c854e9bed30b83e18a3ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress upload directories, suggesting it is used to distribute malicious content or redirect users to phishing sites. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript potentially facilitating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9793

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.
  • 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://aaaexpressheating.com/userfiles/file/24795651187.pdf In PDF document text
    • http://macabrey-luthier.fr/data/Files/xufinobawesuwewu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/pk0plbs97e81s7mcg4fp0rnvvc/mitiwunegerofufozevoluf.pdfIn PDF document text
    • https://grancom.by/upload/docs/48722521156.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/77a8b352e4406c3107703c117f0c5a0b/kuvaniz.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/xolaja.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/vomopadita.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/betewaronolemupajij.pdfIn PDF document text
    • https://aokman-drive.com/d/files/sewowezovubano.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f699c739f---54254904235.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c925f9180eb63b01f9eea6690dbb415a/79129918880.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/filudiketobanoz.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93523416980.pdfIn PDF document text
    • https://robertbah.si/files/file/vekogapi.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/49442374620.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cfc14374---64722672838.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7439825640.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mhlciegcio5jpjmdrtuat1ska8/47657611606.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/35c61ef9519655be56bc9970cf6dd168/72661748678.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/952a362a15af058b54a791616d0edf6d/14887910922.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/87247269296.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ee8il45rbac7of5abud5rar41q/dawix.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf463eb71---bezijowe.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/rosasidezanadavoga.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607197d259ecd---vetabotadafututo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=roma+hukuku+terimleri+s%C3%B6zl%C3%BC%C4%9F%C3%BC+pdfPDF 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_off00032a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00034230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34230 11596 bytes
SHA-256: 1812cd736ceb671a77ea3d545ef131b11925fb63c0fa1c887b6752889bd11884
font_02_sfnt_off00035cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35CC2 22368 bytes
SHA-256: cb3b739680246167ed2fea94eb3f68805db861af69b5c4a7e8862768dcbeeca0