Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ff4e3821b3906c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 18:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b04c3be7f6241bd565e372ba36e61409 SHA-1: 58b3463b176345f2e537a37b63c403d8c01dd020 SHA-256: b8ff4e3821b3906c531fa7ba864c276f7e64fa5c15062bb02541bcc1d931f410
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicated maliciousness, and the document body, though truncated, suggests a social engineering lure related to viewing content. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, likely serving as a distribution point for further malicious content. No scripts were extracted, but the overall pattern suggests a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://bobmeetin.com/media/galleries/files/70876545855.pdf In PDF document text
    • http://pulsarvn.com/media/ftp/file/kitozenuxefamodolabozal.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/juletatusazitivokobumoni.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89d5ca84a---60014284657.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/diluveworenikakotaritid.pdfIn PDF document text
    • http://nanopena.cz/upload/file/japofojusegasetevezisune.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/25454196022.pdfIn PDF document text
    • http://ssp.by/var/upload/88067922756.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/18767690296.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/mupufemoromu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/141c4bdba8f5f8734047a2dd4aaef3d7/66343704595.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/23008365321.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d4404d23625bfb23a0739d41b00ea8ef/vogisakexi.pdfIn PDF document text
    • http://ge-mak.com/files/69236237586.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/jibakaralesow.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/97045320548.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/pemalokotemupidijokema.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0ee838d27cf5ecf3426786056f3de8ea/58833489346.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/dixefebituf.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7e5a15b9249b3349c109c92d77e97fdf/44114346085.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141993e58e06---tofomilenuvaganatibo.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/todekusuvu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614211b900cfc---2182658007.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/50232393568.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/gekusavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+you+sync+your+phonePDF 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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 10504 bytes
SHA-256: b770b7bb754f92a5bc22abdc6c17bdab0b4cae6a411b63e36e373e9c93f74456
font_01_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 17316 bytes
SHA-256: fe702f111d3f4ee02da7a3c3f12bfc2dfe0ea28684cbf590a7d6c87714137ef9
font_02_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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