Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ead18b8ef5a62ea…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 12:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 133029b676c8134b00db7ee0d8f6c78f SHA-1: b26b426c292c2ffa7453b4ae6278e335970b1a4c SHA-256: 7ead18b8ef5a62ea082445c848a6b9ae533ddb53a73d5b1a9c5c3350b84e57bd
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload storage and disposable hosting, combined with ClamAV detection as a phishing trojan, strongly suggests a malicious intent to trick users into downloading further malware or revealing sensitive information. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://phanbonvbm.com/upload/files/29457707505.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607049809b8d2---10742416529.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab9440264---fudijomofaxog.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/69372094194.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/1991309279.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pivedevonodubake.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/magakoletibefujo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f042f3cf82b---11617133464.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ef89c9b8e6dd4478de95af249927a30/11979837813.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lalavesubesi.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1482ed2c5d70b4b12b3e2d9ea85ee09d/57583444705.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/980fvspevbot5pordsof19mp5p/rexinuxefubebadu.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/vegaxujezolemidewatolage.pdfIn PDF document text
    • http://dgjst.com/upfile/file/lamowes.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46cd68920---vinowadomigepigabukugeno.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/72008929939.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/48214592193.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5bf7f1e83---gelalosemujevu.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/wavodurutefobu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c174fcc1893---87772319188.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jugebebubirajom.pdfIn PDF document text
    • http://4darchitecture.org/img/all/lasudikajogisobakukireto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pte+academic+exam+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_off0000cd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 10344 bytes
SHA-256: 0fc4168594987b3db3d1bf6594ebd9234dbe24b81bfe72414513e575be291bd1
font_02_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 17624 bytes
SHA-256: 60c0fb639962a12c1538c887c38a29240e8421837aa6895397d0a6e9a4a58b93

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