Malicious PDF — malware analysis report

Static analysis result for SHA-256 099d2672d02cc864…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 17:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fefd218d69e74ee74a25aea13200818 SHA-1: e6b44c299f317dede4155fc9f28817bd8a5331aa SHA-256: 099d2672d02cc864a62504faffd70713708e28010dd08b8dbc29ec330e32bd76
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 http://wcsps.com.tw/ckfinder/userfiles/files/pituxofop.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fe11f310071e246dfa7fef2d3fe54bd/kunanonuwebosaweke.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5hn9nfsjhmgp8lcfek8mf2l6sc/dovepododasuxefegepibarij.pdfIn PDF document text
    • http://techmechengineers.com/uploads/32853821211.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/lefenepuvor.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe46899e2---datimovobokoribukovamavuk.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/jezujijokusebijepasezo.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/nodipigaxigekag.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/40167470236.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/25094609273.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/55228298589.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c17de2e90---20880206932.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609411a52afc2---38411451132.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcadb625c7---38617633178.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/80758655053.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/11f0a8796103f7236ac1e1614f70e079/mogewivir.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac384ba6037---furexesuxikavuzeb.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/47378414559.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/libujodenoduvowatafo.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/19613585647.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/1974973083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=soay+sheep+for+salePDF 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_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 10348 bytes
SHA-256: c4f82773c3e6a96204181bca3a8c81f9ba81905b487c2b2d4a0f55f179c3e4b3
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 17852 bytes
SHA-256: 7e65b9f199bddd3fb62d9f011fc6af411c7f262c8d8c67b771d323a60e5745b4
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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