Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fbc898c8bc35d0…

MALICIOUS

PDF

70.0 KB Created: 2021-09-07 23:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3a9aba013f08233ee730764c5981b06 SHA-1: 36e7f09a9c3ca6d92cdd23bac21b6c22de963c5f SHA-256: 22fbc898c8bc35d0fc14a7b30068c681d6be91ea30bb72516ec071cc4242e265
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is designed as a phishing lure, presenting a screenshot to obscure clickable links. The embedded JavaScript and numerous external URIs point to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://pointvirgule.ca/upload/editor/file/dinexaxi.pdf In PDF document text
    • http://turagent007.ru/userfiles/file/57018618522.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/xasawuzuxu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a74cc6d827d---teledegugugofid.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/51465606838.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/52810000728.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210628201523816813s5irlk.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/bepuv.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/ronotixodesedogunan.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/8444394151.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/35353292662.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1b97930541cb9dcd744e249aff19e123/keloli.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ee8962749cfd0d320c8e67db435052ed/nuxasabefatapalovif.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1bcb6cf68c7d53e0dccb415eea8892ba/25492575703.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/rulavutifuge.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094db53b80ee---girikegonamakexo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/21546193463.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36bf94ec7c---nidonatefaj.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/28021699876.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-15/20210615160148502431.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/lulelituzedufe.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/11764759501.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/dorokilanukizatojabeg.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ff54p0ad8si2f4h0r55cc89nb2/kozadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+tibetan+book+of+the+dead+first+complete+translation+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_off0000b439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB439 14328 bytes
SHA-256: 19408b217e9eec9697175c0e185937c0447ace73569d95727271e38628c1a30c
font_01_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 11080 bytes
SHA-256: 1a4453959e8c08d21829a8bf6191fc68235c5a31c059fd72c6f004b5734b01ac
font_02_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1