Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c22ba606fa6fb…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 09:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cc61c99cc72e5898e4d1617505fc43c SHA-1: d66387b57c7e86fe2c46922005c4f1ee2aa39af7 SHA-256: 845c22ba606fa6fb22dbf915d36ed5d0ce152ffebe0879d8a189228e9fa61343
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://abcoegypt.com/userfiles/files/65105273709.pdf In PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/ziborujewevelote.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15d174dbc---32905966535.pdfIn PDF document text
    • https://bfull.ru/uploads/files/60168882469.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/lusoza.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/49011278635.pdfIn PDF document text
    • http://stylekd.ru/files/6898098445.pdfIn PDF document text
    • https://kawanmto.com/contents//files/furudezonixulupoxegotumax.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/61926464022.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0446020653---bonajixinogodabiwekatiji.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c8c0b96ae1b77e6318b15e40c6d0625d/31708081139.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/jomeke.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ff130b2---89654323293.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/jigosiwolepat.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/wibanositopifofokisemov.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/roxolijudapofobixikibe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0nflsdqtmh936j2jfbd4nbdscg/78807964536.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742428016d0---petokusapusupotize.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/5f00deead6b2ee322928e4ae0f30616e/18800620186.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fobisivukesejevolax.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3b80b7bssomjk672gi9j4hvbc0/41474824214.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/polunabomiwetigejudogo.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eae53f75a43bc5dec502c254ddd60694/27866880353.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/torixeminanozozagenilefi.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac8af5c388---64948190778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=van+dorn+injection+molding+machine+manual+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_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 17860 bytes
SHA-256: e801cb4471fa2c77c566c72b7bb68b3f6a54a376039070af874a99c4770c4e15
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 11100 bytes
SHA-256: 9bd3d8d7b598116d5a4becef5ab73e73efaf7b5ddbdd0393d754cabc2ea018cb

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