Malicious PDF — malware analysis report

Static analysis result for SHA-256 4626ab4def88ae5e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 17:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 804bc6ae270925612bb6e7e82f5da83d SHA-1: b1feadeaa53191bba365161c2c886d5b8d23d78a SHA-256: 4626ab4def88ae5e8a3a5de4253c645c922f79c560269c1ab3a8ec6c41495822
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely for phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f9f8607166ffc660955814a5e8cfe41b/kedonegajopipawefas.pdf In PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/nodagiferadijuro.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/62767637670.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/patozopa.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/e0j1e1j454gam5sfd4tjtv2bi9/16107755933.pdfIn PDF document text
    • https://akvaguru.hu/user/file/45010066328.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/lamakabujopesubise.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tegekuzovizuzolebov.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdd4de3db1---dolerodofab.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0e43f1e422c84665fd96e63627c87dfa/85072031711.pdfIn PDF document text
    • http://vo23.ru/upload/file/vibojulivonuxu.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/tozuxuderajepememememaw.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/48824492549.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/11325386138.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ngaqij347nr4ouuramooj1jltf/53607195456.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/78693270057.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160980eaa7d6d1---22241655431.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607113c4b6419---goverufugo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6590d97ba6---15932844736.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/kenusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=etika+perkhidmatan+awam+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be6a1ea37---22708996613.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_off0000c189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC189 16936 bytes
SHA-256: e69f5751359b836c3644b16e967ed952b9ddacfb4076412942637071f2d91bcf
font_01_sfnt_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 10592 bytes
SHA-256: 3787a46f83261ebebc61da9c7d63e6b49050dde6cf553a9e5c8ae3a52374ffde
font_02_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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