Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55c7a94622bf74b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 02:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7aab442e50337f89baf5e0948bd8096a SHA-1: 9a64d071e4cde3a9c4dc51fc62e186ac31788a56 SHA-256: b55c7a94622bf74b6b3383a95e898fdf0f1e5aef0ab29e79e0fcd618bc2022e1
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and the presence of multiple external URIs suggest the document is designed to exploit vulnerabilities or trick the user into downloading further malicious content. Notably, the document contains a 'clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://queure.ru/uplcv?utm_term=bbc+iplayer+radio+download+mp3 PDF link annotation
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a97554fb5022717eeff21d500002c327/zezevebewuwikajiwig.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/745937af9792f8485022e899ed424d11/31936261782.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/fedomedulafipumudivuw.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109090516258874.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/72406018818.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///vemikuvalak.pdfIn PDF document text
    • http://vuason.vn/upload/files/mefosibisuzodusepanaguza.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/68978980704.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/40444871146.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/boruvadonuvo.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/66217621057.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/37688826478.pdfIn PDF document text
    • http://c-amc.com/upload/files/wojufimubisonuxizi.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/80440371422.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd854d220---87166273404.pdfIn PDF document text
    • https://betsin.org/userfiles/files/zifamoludi.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/30095516153.pdfIn PDF document text
    • https://partetesal.ir/data/file/wevikowigununifidi.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/23370628883.pdfIn PDF document text
    • http://bdsductri.com/upload/files/57771872217.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/38893030889.pdfIn PDF document text
    • https://tch.lu/files/files/405238983.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/lijofumokujatikazegen.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091411312873499.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/17955365390.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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 18416 bytes
SHA-256: e71699281754579f76caacd0708e6528325e40bc3f249b5574406f0583ed923e
font_01_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 10976 bytes
SHA-256: 8cf33ff1a7eb230c10245dfbc9525b3df6d710d80e9cb6e6f5f6627130245d1b

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