Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb72ad80a176ec9f…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 14:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36973ce0eb25e8bb80591021892d5b4f SHA-1: 21eae6fa0e61ed5be6fef18736cb52e6fde34ad3 SHA-256: cb72ad80a176ec9fa95fb34c55d1a01a1aa2676600daa9ac07c6c7764928eae6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=android+1+hungry+shark+evolution PDF link annotation
    • http://theurbanbazzaar.com/userfiles/file/bolunelowugolegelasebutap.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/5388056495.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/2399520478.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xizejokamivefolufazobidi.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/doruwaxofa.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/67808003879.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/35519683659.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/veliruronupewowe.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/padasakaxejed.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/bubagizixob.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/duvereropavawoluwewo.pdfIn PDF document text
    • https://kawanmto.org/contents/files/32838078230.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/27394346031.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/vifoze.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614738a615a80---lakuwepanusamemafob.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/51825209557.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/ferivosovosazaxo.pdfIn PDF document text
    • http://ccadl.com/files/20210911140005.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/96598779439.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2afa03bb847e520845ed74bb7e1caebb/61828506124.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/laromud.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1614448e22a339---xepuferelixodop.pdfIn PDF document text
    • https://atiksigorta.com/files/nerapimatajazanegaletizul.pdfIn PDF document text
    • 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_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 10932 bytes
SHA-256: 4bab6a33960f9b1414bf7ecd87f4358b256a0a45108c76a261ce03ee3fc2c201
font_01_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 17616 bytes
SHA-256: f646f390c10668a9de32ef97ca8ba0c00a5668229341161c3a5c6009a4f93a4d
font_02_sfnt_off00010d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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